Convert //cc from scoped_ptr to std::unique_ptr.

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 "base/macros.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;
+  std::unique_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl) override;
 
   bool Update() 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_