diff --git a/shell/browser/api/electron_api_system_preferences.h b/shell/browser/api/electron_api_system_preferences.h
index 55045a62c16e..8ab140adb9c7 100644
--- a/shell/browser/api/electron_api_system_preferences.h
+++ b/shell/browser/api/electron_api_system_preferences.h
@@ -26,7 +26,7 @@ namespace electron {
 namespace api {
 
 #if defined(OS_MAC)
-enum NotificationCenterKind {
+enum class NotificationCenterKind {
   kNSDistributedNotificationCenter = 0,
   kNSNotificationCenter,
   kNSWorkspaceNotificationCenter,
diff --git a/shell/browser/api/electron_api_system_preferences_mac.mm b/shell/browser/api/electron_api_system_preferences_mac.mm
index a06879bfb18c..43318c456d2e 100644
--- a/shell/browser/api/electron_api_system_preferences_mac.mm
+++ b/shell/browser/api/electron_api_system_preferences_mac.mm
@@ -140,12 +140,13 @@ void SystemPreferences::PostNotification(const std::string& name,
 int SystemPreferences::SubscribeNotification(
     const std::string& name,
     const NotificationCallback& callback) {
-  return DoSubscribeNotification(name, callback,
-                                 kNSDistributedNotificationCenter);
+  return DoSubscribeNotification(
+      name, callback, NotificationCenterKind::kNSDistributedNotificationCenter);
 }
 
 void SystemPreferences::UnsubscribeNotification(int request_id) {
-  DoUnsubscribeNotification(request_id, kNSDistributedNotificationCenter);
+  DoUnsubscribeNotification(
+      request_id, NotificationCenterKind::kNSDistributedNotificationCenter);
 }
 
 void SystemPreferences::PostLocalNotification(const std::string& name,
@@ -159,11 +160,13 @@ void SystemPreferences::PostLocalNotification(const std::string& name,
 int SystemPreferences::SubscribeLocalNotification(
     const std::string& name,
     const NotificationCallback& callback) {
-  return DoSubscribeNotification(name, callback, kNSNotificationCenter);
+  return DoSubscribeNotification(name, callback,
+                                 NotificationCenterKind::kNSNotificationCenter);
 }
 
 void SystemPreferences::UnsubscribeLocalNotification(int request_id) {
-  DoUnsubscribeNotification(request_id, kNSNotificationCenter);
+  DoUnsubscribeNotification(request_id,
+                            NotificationCenterKind::kNSNotificationCenter);
 }
 
 void SystemPreferences::PostWorkspaceNotification(
@@ -179,12 +182,13 @@ void SystemPreferences::PostWorkspaceNotification(
 int SystemPreferences::SubscribeWorkspaceNotification(
     const std::string& name,
     const NotificationCallback& callback) {
-  return DoSubscribeNotification(name, callback,
-                                 kNSWorkspaceNotificationCenter);
+  return DoSubscribeNotification(
+      name, callback, NotificationCenterKind::kNSWorkspaceNotificationCenter);
 }
 
 void SystemPreferences::UnsubscribeWorkspaceNotification(int request_id) {
-  DoUnsubscribeNotification(request_id, kNSWorkspaceNotificationCenter);
+  DoUnsubscribeNotification(
+      request_id, NotificationCenterKind::kNSWorkspaceNotificationCenter);
 }
 
 int SystemPreferences::DoSubscribeNotification(
@@ -195,13 +199,13 @@ int SystemPreferences::DoSubscribeNotification(
   __block NotificationCallback copied_callback = callback;
   NSNotificationCenter* center;
   switch (kind) {
-    case kNSDistributedNotificationCenter:
+    case NotificationCenterKind::kNSDistributedNotificationCenter:
       center = [NSDistributedNotificationCenter defaultCenter];
       break;
-    case kNSNotificationCenter:
+    case NotificationCenterKind::kNSNotificationCenter:
       center = [NSNotificationCenter defaultCenter];
       break;
-    case kNSWorkspaceNotificationCenter:
+    case NotificationCenterKind::kNSWorkspaceNotificationCenter:
       center = [[NSWorkspace sharedWorkspace] notificationCenter];
       break;
     default:
@@ -239,13 +243,13 @@ void SystemPreferences::DoUnsubscribeNotification(int request_id,
     id observer = iter->second;
     NSNotificationCenter* center;
     switch (kind) {
-      case kNSDistributedNotificationCenter:
+      case NotificationCenterKind::kNSDistributedNotificationCenter:
         center = [NSDistributedNotificationCenter defaultCenter];
         break;
-      case kNSNotificationCenter:
+      case NotificationCenterKind::kNSNotificationCenter:
         center = [NSNotificationCenter defaultCenter];
         break;
-      case kNSWorkspaceNotificationCenter:
+      case NotificationCenterKind::kNSWorkspaceNotificationCenter:
         center = [[NSWorkspace sharedWorkspace] notificationCenter];
         break;
       default:
diff --git a/shell/browser/api/electron_api_web_request.cc b/shell/browser/api/electron_api_web_request.cc
index f69ddad18d61..68fcb8878e4e 100644
--- a/shell/browser/api/electron_api_web_request.cc
+++ b/shell/browser/api/electron_api_web_request.cc
@@ -257,21 +257,26 @@ WebRequest::~WebRequest() {
 gin::ObjectTemplateBuilder WebRequest::GetObjectTemplateBuilder(
     v8::Isolate* isolate) {
   return gin::Wrappable<WebRequest>::GetObjectTemplateBuilder(isolate)
-      .SetMethod("onBeforeRequest",
-                 &WebRequest::SetResponseListener<kOnBeforeRequest>)
-      .SetMethod("onBeforeSendHeaders",
-                 &WebRequest::SetResponseListener<kOnBeforeSendHeaders>)
-      .SetMethod("onHeadersReceived",
-                 &WebRequest::SetResponseListener<kOnHeadersReceived>)
+      .SetMethod(
+          "onBeforeRequest",
+          &WebRequest::SetResponseListener<ResponseEvent::kOnBeforeRequest>)
+      .SetMethod(
+          "onBeforeSendHeaders",
+          &WebRequest::SetResponseListener<ResponseEvent::kOnBeforeSendHeaders>)
+      .SetMethod(
+          "onHeadersReceived",
+          &WebRequest::SetResponseListener<ResponseEvent::kOnHeadersReceived>)
       .SetMethod("onSendHeaders",
-                 &WebRequest::SetSimpleListener<kOnSendHeaders>)
+                 &WebRequest::SetSimpleListener<SimpleEvent::kOnSendHeaders>)
       .SetMethod("onBeforeRedirect",
-                 &WebRequest::SetSimpleListener<kOnBeforeRedirect>)
-      .SetMethod("onResponseStarted",
-                 &WebRequest::SetSimpleListener<kOnResponseStarted>)
+                 &WebRequest::SetSimpleListener<SimpleEvent::kOnBeforeRedirect>)
+      .SetMethod(
+          "onResponseStarted",
+          &WebRequest::SetSimpleListener<SimpleEvent::kOnResponseStarted>)
       .SetMethod("onErrorOccurred",
-                 &WebRequest::SetSimpleListener<kOnErrorOccurred>)
-      .SetMethod("onCompleted", &WebRequest::SetSimpleListener<kOnCompleted>);
+                 &WebRequest::SetSimpleListener<SimpleEvent::kOnErrorOccurred>)
+      .SetMethod("onCompleted",
+                 &WebRequest::SetSimpleListener<SimpleEvent::kOnCompleted>);
 }
 
 const char* WebRequest::GetTypeName() {
@@ -286,8 +291,8 @@ int WebRequest::OnBeforeRequest(extensions::WebRequestInfo* info,
                                 const network::ResourceRequest& request,
                                 net::CompletionOnceCallback callback,
                                 GURL* new_url) {
-  return HandleResponseEvent(kOnBeforeRequest, info, std::move(callback),
-                             new_url, request);
+  return HandleResponseEvent(ResponseEvent::kOnBeforeRequest, info,
+                             std::move(callback), new_url, request);
 }
 
 int WebRequest::OnBeforeSendHeaders(extensions::WebRequestInfo* info,
@@ -295,7 +300,7 @@ int WebRequest::OnBeforeSendHeaders(extensions::WebRequestInfo* info,
                                     BeforeSendHeadersCallback callback,
                                     net::HttpRequestHeaders* headers) {
   return HandleResponseEvent(
-      kOnBeforeSendHeaders, info,
+      ResponseEvent::kOnBeforeSendHeaders, info,
       base::BindOnce(std::move(callback), std::set<std::string>(),
                      std::set<std::string>()),
       headers, request, *headers);
@@ -312,25 +317,26 @@ int WebRequest::OnHeadersReceived(
       original_response_headers ? original_response_headers->GetStatusLine()
                                 : std::string();
   return HandleResponseEvent(
-      kOnHeadersReceived, info, std::move(callback),
+      ResponseEvent::kOnHeadersReceived, info, std::move(callback),
       std::make_pair(override_response_headers, status_line), request);
 }
 
 void WebRequest::OnSendHeaders(extensions::WebRequestInfo* info,
                                const network::ResourceRequest& request,
                                const net::HttpRequestHeaders& headers) {
-  HandleSimpleEvent(kOnSendHeaders, info, request, headers);
+  HandleSimpleEvent(SimpleEvent::kOnSendHeaders, info, request, headers);
 }
 
 void WebRequest::OnBeforeRedirect(extensions::WebRequestInfo* info,
                                   const network::ResourceRequest& request,
                                   const GURL& new_location) {
-  HandleSimpleEvent(kOnBeforeRedirect, info, request, new_location);
+  HandleSimpleEvent(SimpleEvent::kOnBeforeRedirect, info, request,
+                    new_location);
 }
 
 void WebRequest::OnResponseStarted(extensions::WebRequestInfo* info,
                                    const network::ResourceRequest& request) {
-  HandleSimpleEvent(kOnResponseStarted, info, request);
+  HandleSimpleEvent(SimpleEvent::kOnResponseStarted, info, request);
 }
 
 void WebRequest::OnErrorOccurred(extensions::WebRequestInfo* info,
@@ -338,7 +344,7 @@ void WebRequest::OnErrorOccurred(extensions::WebRequestInfo* info,
                                  int net_error) {
   callbacks_.erase(info->id);
 
-  HandleSimpleEvent(kOnErrorOccurred, info, request, net_error);
+  HandleSimpleEvent(SimpleEvent::kOnErrorOccurred, info, request, net_error);
 }
 
 void WebRequest::OnCompleted(extensions::WebRequestInfo* info,
@@ -346,7 +352,7 @@ void WebRequest::OnCompleted(extensions::WebRequestInfo* info,
                              int net_error) {
   callbacks_.erase(info->id);
 
-  HandleSimpleEvent(kOnCompleted, info, request, net_error);
+  HandleSimpleEvent(SimpleEvent::kOnCompleted, info, request, net_error);
 }
 
 void WebRequest::OnRequestWillBeDestroyed(extensions::WebRequestInfo* info) {
diff --git a/shell/browser/api/electron_api_web_request.h b/shell/browser/api/electron_api_web_request.h
index c1f756223367..8b7b25bd1d7c 100644
--- a/shell/browser/api/electron_api_web_request.h
+++ b/shell/browser/api/electron_api_web_request.h
@@ -86,14 +86,14 @@ class WebRequest : public gin::Wrappable<WebRequest>, public WebRequestAPI {
   WebRequest(v8::Isolate* isolate, content::BrowserContext* browser_context);
   ~WebRequest() override;
 
-  enum SimpleEvent {
+  enum class SimpleEvent {
     kOnSendHeaders,
     kOnBeforeRedirect,
     kOnResponseStarted,
     kOnCompleted,
     kOnErrorOccurred,
   };
-  enum ResponseEvent {
+  enum class ResponseEvent {
     kOnBeforeRequest,
     kOnBeforeSendHeaders,
     kOnHeadersReceived,