Remove parts of //cc we aren't using

cc/layers/video_layer.h

-// Copyright 2010 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 CC_LAYERS_VIDEO_LAYER_H_
-#define CC_LAYERS_VIDEO_LAYER_H_
-
-#include "base/callback.h"
-#include "cc/base/cc_export.h"
-#include "cc/layers/layer.h"
-#include "media/base/video_rotation.h"
-
-namespace media { class VideoFrame; }
-
-namespace cc {
-
-class VideoFrameProvider;
-class VideoLayerImpl;
-
-// A Layer that contains a Video element.
-class CC_EXPORT VideoLayer : public Layer {
- public:
-  static scoped_refptr<VideoLayer> Create(VideoFrameProvider* provider,
-                                          media::VideoRotation video_rotation);
-
-  scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl) override;
-
-  bool Update(ResourceUpdateQueue* queue,
-              const OcclusionTracker<Layer>* occlusion) override;
-
- private:
-  VideoLayer(VideoFrameProvider* provider, media::VideoRotation video_rotation);
-  ~VideoLayer() override;
-
-  // This pointer is only for passing to VideoLayerImpl's constructor. It should
-  // never be dereferenced by this class.
-  VideoFrameProvider* provider_;
-
-  media::VideoRotation video_rotation_;
-
-  DISALLOW_COPY_AND_ASSIGN(VideoLayer);
-};
-
-}  // namespace cc
-
-#endif  // CC_LAYERS_VIDEO_LAYER_H_