cc: Cleanup class/struct forward declarations

cc/layers/picture_layer.h

 // Copyright 2012 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_PICTURE_LAYER_H_
 #define CC_LAYERS_PICTURE_LAYER_H_
 
 #include "base/macros.h"
 #include "cc/base/invalidation_region.h"
 #include "cc/debug/devtools_instrumentation.h"
 #include "cc/debug/micro_benchmark_controller.h"
 #include "cc/layers/layer.h"
 
 namespace cc {
 
-namespace proto {
-class PictureLayerProperties;
-}
-
 class ContentLayerClient;
 class DisplayItemList;
 class RecordingSource;
-class ResourceUpdateQueue;
 
 class CC_EXPORT PictureLayer : public Layer {
  public:
   static scoped_refptr<PictureLayer> Create(ContentLayerClient* client);
 
   void ClearClient();
 
   void SetNearestNeighbor(bool nearest_neighbor);
   bool nearest_neighbor() const {
     return picture_layer_inputs_.nearest_neighbor;
@@ skipping 61 matching lines @@
 
   int update_source_frame_number_;
   bool is_mask_;
 
   DISALLOW_COPY_AND_ASSIGN(PictureLayer);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_PICTURE_LAYER_H_