Clean up forward declarations in Source/modules

Source/modules/gamepad/NavigatorGamepad.h

 /*
  * 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 20 matching lines @@
 #include "core/frame/PlatformEventController.h"
 #include "platform/AsyncMethodRunner.h"
 #include "platform/Supplementable.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/WebGamepads.h"
 
 namespace blink {
 
 class Document;
 class Gamepad;
-class Gamepads;
 class GamepadList;
 class Navigator;
 class WebKitGamepadList;
 
 class NavigatorGamepad final : public NoBaseWillBeGarbageCollectedFinalized<NavigatorGamepad>, public WillBeHeapSupplement<Navigator>, public DOMWindowProperty, public PlatformEventController, public DOMWindowLifecycleObserver {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(NavigatorGamepad);
 public:
     static NavigatorGamepad* from(Document&);
     static NavigatorGamepad& from(Navigator&);
     virtual ~NavigatorGamepad();
@@ skipping 34 matching lines @@
 
     PersistentWillBeMember<GamepadList> m_gamepads;
     PersistentWillBeMember<WebKitGamepadList> m_webkitGamepads;
     PersistentHeapDequeWillBeHeapDeque<Member<Gamepad> > m_pendingEvents;
     AsyncMethodRunner<NavigatorGamepad> m_dispatchOneEventRunner;
 };
 
 } // namespace blink
 
 #endif // NavigatorGamepad_h