Revert of Remove content::NotificationPermissionDispatcher.

third_party/WebKit/public/web/WebFrameClient.h

Index: third_party/WebKit/public/web/WebFrameClient.h
diff --git a/third_party/WebKit/public/web/WebFrameClient.h b/third_party/WebKit/public/web/WebFrameClient.h
index 45af6e741597cd8c6b940ae850a8f41a0986d385..ebde5da8af21027974c7ee9c42cd823c54ae8549 100644
--- a/third_party/WebKit/public/web/WebFrameClient.h
+++ b/third_party/WebKit/public/web/WebFrameClient.h
@@ -89,6 +89,7 @@
 class WebMediaPlayerSource;
 class WebMediaSession;
 class WebMediaStream;
+class WebNotificationPermissionCallback;
 class WebServiceWorkerProvider;
 class WebSocketHandle;
 class WebPlugin;
@@ -370,6 +371,11 @@
     // Returns the effective connection type when the frame was fetched.
     virtual WebEffectiveConnectionType getEffectiveConnectionType() { return WebEffectiveConnectionType::TypeUnknown; }
 
+    // Web Notifications ---------------------------------------------------
+
+    // Requests permission to display platform notifications on the origin of this frame.
+    virtual void requestNotificationPermission(const WebSecurityOrigin&, WebNotificationPermissionCallback* callback) { }
+
 
     // Push API ---------------------------------------------------