Allow the embedder to disable the Notification constructor.

Source/web/WebRuntimeFeatures.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 140 matching lines @@
 void WebRuntimeFeatures::enableMediaCapture(bool enable)
 {
     RuntimeEnabledFeatures::setMediaCaptureEnabled(enable);
 }
 
 void WebRuntimeFeatures::enableMediaSource(bool enable)
 {
     RuntimeEnabledFeatures::setMediaSourceEnabled(enable);
 }
 
+void WebRuntimeFeatures::enableNotificationConstructor(bool enable)
+{
+    RuntimeEnabledFeatures::setNotificationConstructorEnabled(enable);
+}
+
 void WebRuntimeFeatures::enableNotifications(bool enable)
 {
     RuntimeEnabledFeatures::setNotificationsEnabled(enable);
 }
 
 void WebRuntimeFeatures::enableNavigatorContentUtils(bool enable)
 {
     RuntimeEnabledFeatures::setNavigatorContentUtilsEnabled(enable);
 }
 
@@ skipping 146 matching lines @@
 {
     RuntimeEnabledFeatures::setPushMessagingDataEnabled(enable);
 }
 
 void WebRuntimeFeatures::enableUnsafeES3APIs(bool enable)
 {
     RuntimeEnabledFeatures::setUnsafeES3APIsEnabled(enable);
 }
 
 } // namespace blink