blink: Cleanup class forward declarations

third_party/WebKit/Source/modules/mediastream/MediaDevicesRequest.h

 /*
  * Copyright (C) 2014 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 17 matching lines @@
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "core/dom/ActiveDOMObject.h"
 #include "modules/ModulesExport.h"
 #include "modules/mediastream/MediaDeviceInfo.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class Document;
-class ExceptionState;
 class UserMediaController;
 class ScriptState;
 class ScriptPromiseResolver;
 
 class MODULES_EXPORT MediaDevicesRequest final
     : public GarbageCollectedFinalized<MediaDevicesRequest>,
       public ActiveDOMObject {
   USING_GARBAGE_COLLECTED_MIXIN(MediaDevicesRequest);
 
  public:
@@ skipping 14 matching lines @@
  private:
   MediaDevicesRequest(ScriptState*, UserMediaController*);
 
   Member<UserMediaController> m_controller;
   Member<ScriptPromiseResolver> m_resolver;
 };
 
 }  // namespace blink
 
 #endif  // MediaDevicesRequest_h