diff --git a/atom/browser/atom_browser_client.cc b/atom/browser/atom_browser_client.cc
index ca12723bb37..63a1ea46b16 100644
--- a/atom/browser/atom_browser_client.cc
+++ b/atom/browser/atom_browser_client.cc
@@ -46,11 +46,6 @@ namespace atom {
 
 namespace {
 
-// The default routing id of WebContents.
-// In Electron each RenderProcessHost only has one WebContents, so this ID is
-// same for every WebContents.
-int kDefaultRoutingID = 1;
-
 // Next navigation should not restart renderer process.
 bool g_suppress_renderer_process_restart = false;
 
@@ -278,8 +273,8 @@ brightray::BrowserMainParts* AtomBrowserClient::OverrideCreateBrowserMainParts(
 void AtomBrowserClient::WebNotificationAllowed(
     int render_process_id,
     const base::Callback<void(bool)>& callback) {
-  content::WebContents* web_contents = content::WebContents::FromRenderViewHost(
-      content::RenderViewHost::FromID(render_process_id, kDefaultRoutingID));
+  content::WebContents* web_contents =
+      WebContentsPreferences::GetWebContentsFromProcessID(render_process_id);
   if (!web_contents) {
     callback.Run(false);
     return;
diff --git a/atom/browser/atom_permission_manager.cc b/atom/browser/atom_permission_manager.cc
index 720d1f93b32..f7523c07ff8 100644
--- a/atom/browser/atom_permission_manager.cc
+++ b/atom/browser/atom_permission_manager.cc
@@ -6,6 +6,7 @@
 
 #include <vector>
 
+#include "atom/browser/web_contents_preferences.h"
 #include "content/public/browser/child_process_security_policy.h"
 #include "content/public/browser/permission_type.h"
 #include "content/public/browser/render_frame_host.h"
@@ -17,17 +18,12 @@ namespace atom {
 
 namespace {
 
-// Must be kept in sync with atom_browser_client.cc
-int kDefaultRoutingID = 2;
-
 bool WebContentsDestroyed(int process_id) {
-  auto rvh = content::RenderViewHost::FromID(process_id, kDefaultRoutingID);
-  if (rvh) {
-    auto contents = content::WebContents::FromRenderViewHost(rvh);
-    return contents->IsBeingDestroyed();
-  }
-
-  return true;
+  auto contents =
+      WebContentsPreferences::GetWebContentsFromProcessID(process_id);
+  if (!contents)
+    return true;
+  return contents->IsBeingDestroyed();
 }
 
 }  // namespace