diff --git a/atom/browser/ui/webui/pdf_viewer_handler.cc b/atom/browser/ui/webui/pdf_viewer_handler.cc
index 699119fb2802..ccebec9931b3 100644
--- a/atom/browser/ui/webui/pdf_viewer_handler.cc
+++ b/atom/browser/ui/webui/pdf_viewer_handler.cc
@@ -119,7 +119,7 @@ void PdfViewerHandler::Initialize(const base::ListValue* args) {
   } else {
     initialize_callback_id_ = callback_id->CreateDeepCopy();
   }
-  
+
   auto zoom_controller = WebContentsZoomController::FromWebContents(
     web_ui()->GetWebContents());
   zoom_controller->SetZoomMode(WebContentsZoomController::ZOOM_MODE_MANUAL);
@@ -211,7 +211,7 @@ void PdfViewerHandler::Reload(const base::ListValue* args) {
 void PdfViewerHandler::OnZoomLevelChanged(content::WebContents* web_contents,
     double level, bool is_temporary) {
   if (web_ui()->GetWebContents() == web_contents) {
-    CallJavascriptFunction("cr.webUIListenerCallback", 
+    CallJavascriptFunction("cr.webUIListenerCallback",
       base::StringValue("onZoomLevelChanged"),
       base::Value(content::ZoomLevelToZoomFactor(level)));
   }
diff --git a/atom/browser/ui/webui/pdf_viewer_handler.h b/atom/browser/ui/webui/pdf_viewer_handler.h
index 46e7ac8d4edc..e6ae315e8764 100644
--- a/atom/browser/ui/webui/pdf_viewer_handler.h
+++ b/atom/browser/ui/webui/pdf_viewer_handler.h
@@ -43,7 +43,7 @@ class PdfViewerHandler : public content::WebUIMessageHandler,
   void SetZoom(const base::ListValue* args);
   void GetStrings(const base::ListValue* args);
   void Reload(const base::ListValue* args);
-  void OnZoomLevelChanged(content::WebContents* web_contents, double level, 
+  void OnZoomLevelChanged(content::WebContents* web_contents, double level,
       bool is_temporary);
 
   std::unique_ptr<base::Value> initialize_callback_id_;
diff --git a/atom/browser/web_contents_zoom_controller.cc b/atom/browser/web_contents_zoom_controller.cc
index 764fa939784c..3c8d512b6bb4 100644
--- a/atom/browser/web_contents_zoom_controller.cc
+++ b/atom/browser/web_contents_zoom_controller.cc
@@ -67,7 +67,7 @@ void WebContentsZoomController::SetZoomLevel(double level) {
 
   content::HostZoomMap* zoom_map =
       content::HostZoomMap::GetForWebContents(web_contents());
-  if (zoom_mode_ == ZOOM_MODE_ISOLATED || 
+  if (zoom_mode_ == ZOOM_MODE_ISOLATED ||
       zoom_map->UsesTemporaryZoomLevel(render_process_id, render_view_id)) {
     zoom_map->SetTemporaryZoomLevel(
       render_process_id, render_view_id, level);
@@ -164,7 +164,7 @@ void WebContentsZoomController::SetZoomMode(ZoomMode new_mode) {
         // When we don't call any HostZoomMap set functions, we send the event
         // manually.
         for (Observer& observer : observers_)
-          observer.OnZoomLevelChanged(web_contents(), original_zoom_level, 
+          observer.OnZoomLevelChanged(web_contents(), original_zoom_level,
             false);
       }
       break;
@@ -181,7 +181,7 @@ void WebContentsZoomController::SetZoomMode(ZoomMode new_mode) {
         // When we don't call any HostZoomMap set functions, we send the event
         // manually.
         for (Observer& observer : observers_)
-          observer.OnZoomLevelChanged(web_contents(), original_zoom_level, 
+          observer.OnZoomLevelChanged(web_contents(), original_zoom_level,
             false);
       }
       break;
@@ -211,7 +211,7 @@ void WebContentsZoomController::ResetZoomModeOnNavigationIfNeeded(
   double new_zoom_level = zoom_map->GetZoomLevelForHostAndScheme(
       url.scheme(), net::GetHostOrSpecFromURL(url));
   for (Observer& observer : observers_)
-    observer.OnZoomLevelChanged(web_contents(), new_zoom_level, 
+    observer.OnZoomLevelChanged(web_contents(), new_zoom_level,
       false);
   zoom_map->ClearTemporaryZoomLevel(render_process_id, render_view_id);
   zoom_mode_ = ZOOM_MODE_DEFAULT;
diff --git a/atom/browser/web_contents_zoom_controller.h b/atom/browser/web_contents_zoom_controller.h
index 493219c09410..220d5c45bfad 100644
--- a/atom/browser/web_contents_zoom_controller.h
+++ b/atom/browser/web_contents_zoom_controller.h
@@ -28,7 +28,7 @@ class WebContentsZoomController
    protected:
     virtual ~Observer() {}
   };
-  
+
   // Defines how zoom changes are handled.
   enum ZoomMode {
     // Results in default zoom behavior, i.e. zoom changes are handled
@@ -67,7 +67,7 @@ class WebContentsZoomController
 
   // Sets the zoom mode, which defines zoom behavior (see enum ZoomMode).
   void SetZoomMode(ZoomMode zoom_mode);
-  
+
   void ResetZoomModeOnNavigationIfNeeded(const GURL& url);
 
   ZoomMode zoom_mode() const { return zoom_mode_; }