[cc] Cleanup: remove unused class - CachingBitmapContentLayerUpdater

cc/resources/caching_bitmap_content_layer_updater.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_RESOURCES_CACHING_BITMAP_CONTENT_LAYER_UPDATER_H_
-#define CC_RESOURCES_CACHING_BITMAP_CONTENT_LAYER_UPDATER_H_
-
-#include "base/compiler_specific.h"
-#include "cc/resources/bitmap_content_layer_updater.h"
-#include "third_party/skia/include/core/SkBitmap.h"
-
-namespace cc {
-
-class CachingBitmapContentLayerUpdater : public BitmapContentLayerUpdater {
- public:
-  static scoped_refptr<CachingBitmapContentLayerUpdater> Create(
-      scoped_ptr<LayerPainter>,
-      RenderingStatsInstrumentation* stats_instrumentation,
-      int layer_id);
-
-  virtual void PrepareToUpdate(gfx::Rect content_rect,
-                               gfx::Size tile_size,
-                               float contents_width_scale,
-                               float contents_height_scale,
-                               gfx::Rect* resulting_opaque_rect) OVERRIDE;
-
-  bool pixels_did_change() const {
-    return pixels_did_change_;
-  }
-
- private:
-  CachingBitmapContentLayerUpdater(
-      scoped_ptr<LayerPainter> painter,
-      RenderingStatsInstrumentation* stats_instrumentation,
-      int layer_id);
-  virtual ~CachingBitmapContentLayerUpdater();
-
-  bool pixels_did_change_;
-  SkBitmap cached_bitmap_;
-
-  DISALLOW_COPY_AND_ASSIGN(CachingBitmapContentLayerUpdater);
-};
-
-}  // namespace cc
-
-#endif  // CC_RESOURCES_CACHING_BITMAP_CONTENT_LAYER_UPDATER_H_