blink: Cleanup class forward declarations

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

 /*
  *  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 15 matching lines @@
 #include "modules/ModulesExport.h"
 #include "platform/Timer.h"
 #include "platform/heap/GarbageCollected.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class Document;
-class ExecutionContext;
 class UnsignedLongOrUnsignedLongSequence;
 
 class MODULES_EXPORT VibrationController final
     : public GarbageCollectedFinalized<VibrationController>,
       public ContextLifecycleObserver,
       public PageVisibilityObserver {
   USING_GARBAGE_COLLECTED_MIXIN(VibrationController);
   WTF_MAKE_NONCOPYABLE(VibrationController);
 
  public:
@@ skipping 46 matching lines @@
 
   // Whether an async mojo call to vibrate is pending.
   bool m_isCallingVibrate;
 
   VibrationPattern m_pattern;
 };
 
 }  // namespace blink
 
 #endif  // VibrationController_h