Remove PageVisibilityObserver contextDestroyed() notifications.

third_party/WebKit/Source/modules/vibration/VibrationController.cpp

 /*
  *  Copyright (C) 2012 Samsung Electronics
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Library General Public
  *  License as published by the Free Software Foundation; either
  *  version 2 of the License, or (at your option) any later version.
  *
  *  This library is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 160 matching lines @@
   m_timerDoVibrate.startOneShot(0, BLINK_FROM_HERE);
 }
 
 void VibrationController::contextDestroyed(ExecutionContext*) {
   cancel();
 
   // If the document context was destroyed, never call the mojo service again.
   m_service.reset();
 }
 
-void VibrationController::contextDestroyed(Page*) {}
-
 void VibrationController::pageVisibilityChanged() {
   if (!page()->isPageVisible())
     cancel();
 }
 
 DEFINE_TRACE(VibrationController) {
   ContextLifecycleObserver::trace(visitor);
   PageVisibilityObserver::trace(visitor);
 }
 
 }  // namespace blink