content: Cleanup class/struct forward declarations

content/renderer/media/renderer_webmediaplayer_delegate.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_MEDIA_RENDERER_WEBMEDIAPLAYER_DELEGATE_H_
 #define CONTENT_RENDERER_MEDIA_RENDERER_WEBMEDIAPLAYER_DELEGATE_H_
 
 #include <map>
 #include <memory>
 #include <set>
 
 #include "base/id_map.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time/default_tick_clock.h"
 #include "base/timer/timer.h"
 #include "content/common/content_export.h"
 #include "content/public/renderer/render_frame_observer.h"
 #include "media/blink/webmediaplayer_delegate.h"
 
 #if defined(OS_ANDROID)
 #include "base/time/time.h"
 #endif  // OS_ANDROID
 
-namespace blink {
-class WebMediaPlayer;
-}
-
 namespace media {
 
 enum class MediaContentType;
 
 // An interface to allow a WebMediaPlayerImpl to communicate changes of state
 // to objects that need to know.
 class CONTENT_EXPORT RendererWebMediaPlayerDelegate
     : public content::RenderFrameObserver,
       public NON_EXPORTED_BASE(WebMediaPlayerDelegate),
       public NON_EXPORTED_BASE(
@@ skipping 95 matching lines @@
   // Determined at construction time based on system information; determines
   // when the idle cleanup timer should be fired more aggressively.
   bool is_low_end_device_;
 
   DISALLOW_COPY_AND_ASSIGN(RendererWebMediaPlayerDelegate);
 };
 
 }  // namespace media
 
 #endif  // CONTENT_RENDERER_MEDIA_RENDERER_WEBMEDIAPLAYER_DELEGATE_H_