Revert of Remove content::NotificationPermissionDispatcher.

content/renderer/render_frame_impl.h

Index: content/renderer/render_frame_impl.h
diff --git a/content/renderer/render_frame_impl.h b/content/renderer/render_frame_impl.h
index 0182154103b31c3c200a94a5a40bf1d0fbd96076..a2b0c2ef5ffd2e0b4847c8f682f8e954dd671a0f 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -133,6 +133,7 @@
 class MediaPermissionDispatcher;
 class MidiDispatcher;
 class NavigationState;
+class NotificationPermissionDispatcher;
 class PageState;
 class PepperPluginInstanceImpl;
 class PresentationDispatcher;
@@ -544,6 +545,9 @@
   void didChangeThemeColor() override;
   void dispatchLoad() override;
   blink::WebEffectiveConnectionType getEffectiveConnectionType() override;
+  void requestNotificationPermission(
+      const blink::WebSecurityOrigin& origin,
+      blink::WebNotificationPermissionCallback* callback) override;
   void didChangeSelection(bool is_empty_selection) override;
   blink::WebColorChooser* createColorChooser(
       blink::WebColorChooserClient* client,
@@ -1141,6 +1145,9 @@
   // along with the RenderFrame automatically.  This is why we just store weak
   // references.
 
+  // Dispatches permission requests for Web Notifications.
+  NotificationPermissionDispatcher* notification_permission_dispatcher_;
+
   // Destroyed via the RenderFrameObserver::OnDestruct() mechanism.
   UserMediaClientImpl* web_user_media_client_;