content: Cleanup class/struct forward declarations

content/renderer/media/webmediaplayer_ms_compositor.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_WEBMEDIAPLAYER_MS_COMPOSITOR_H_
 #define CONTENT_RENDERER_MEDIA_WEBMEDIAPLAYER_MS_COMPOSITOR_H_
 
 #include <stddef.h>
 
 #include <map>
@@ skipping 13 matching lines @@
 
 namespace blink {
 class WebMediaStream;
 }
 
 namespace gfx {
 class Size;
 }
 
 namespace media {
-class SkCanvasVideoRenderer;
 class VideoRendererAlgorithm;
 }
 
 namespace content {
 class WebMediaPlayerMS;
 
 // This class is designed to handle the work load on compositor thread for
 // WebMediaPlayerMS. It will be instantiated on the main thread, but destroyed
 // on the compositor thread.
 //
@@ skipping 112 matching lines @@
   base::Lock current_frame_lock_;
 
   // Make sure the weak pointer factory member is the last member of the class.
   base::WeakPtrFactory<WebMediaPlayerMSCompositor> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebMediaPlayerMSCompositor);
 };
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_WEBMEDIAPLAYER_MS_COMPOSITOR_H_