Remove PageVisibilityObserver contextDestroyed() notifications.

third_party/WebKit/Source/modules/gamepad/NavigatorGamepad.cpp

 /*
  * Copyright (C) 2011, 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:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 168 matching lines @@
 NavigatorGamepad::~NavigatorGamepad() {}
 
 const char* NavigatorGamepad::supplementName() {
   return "NavigatorGamepad";
 }
 
 void NavigatorGamepad::contextDestroyed(ExecutionContext*) {
   stopUpdating();
 }
 
-void NavigatorGamepad::contextDestroyed(Page*) {}
-
 void NavigatorGamepad::registerWithDispatcher() {
   GamepadDispatcher::instance().addController(this);
   m_dispatchOneEventRunner->resume();
 }
 
 void NavigatorGamepad::unregisterWithDispatcher() {
   m_dispatchOneEventRunner->suspend();
   GamepadDispatcher::instance().removeController(this);
 }
 
@@ skipping 67 matching lines @@
     if (connectedGamepadChanged || (!oldWasConnected && newIsConnected)) {
       m_pendingEvents.append(newGamepad);
     }
   }
 
   if (!m_pendingEvents.isEmpty())
     m_dispatchOneEventRunner->runAsync();
 }
 
 }  // namespace blink