cc: Clean up OcclusionTracker template parameters.

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"
 
 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);
 
   virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
       OVERRIDE;
 
   virtual bool Update(ResourceUpdateQueue* queue,
-                      const OcclusionTracker* occlusion) OVERRIDE;
+                      const OcclusionTracker<Layer>* occlusion) OVERRIDE;
+
  private:
   explicit VideoLayer(VideoFrameProvider* provider);
   virtual ~VideoLayer();
 
   // This pointer is only for passing to VideoLayerImpl's constructor. It should
   // never be dereferenced by this class.
   VideoFrameProvider* provider_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoLayer);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_VIDEO_LAYER_H_