chrome: Cleanup class/struct forward declarations

chrome/browser/android/compositor/layer/tab_layer.h

 // Copyright 2014 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 CHROME_BROWSER_ANDROID_COMPOSITOR_LAYER_TAB_LAYER_H_
 #define CHROME_BROWSER_ANDROID_COMPOSITOR_LAYER_TAB_LAYER_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "chrome/browser/android/compositor/layer/layer.h"
 
 namespace cc {
-class ImageLayer;
 class Layer;
 class NinePatchLayer;
 class SolidColorLayer;
 class UIResourceLayer;
 }
 
 namespace gfx {
 class Size;
 }
 
 namespace ui {
 class ResourceManager;
 }
 
-class SkBitmap;
-
 namespace android {
 
 class ContentLayer;
 class DecorationTitle;
 class LayerTitleCache;
 class TabContentManager;
 class ToolbarLayer;
 
 // Sub layer tree representation of a tab.  A TabLayer is not tied to
 // specific tab. To specialize it call CustomizeForId() and SetProperties().
@@ skipping 104 matching lines @@
   scoped_refptr<cc::NinePatchLayer> shadow_;
   scoped_refptr<cc::UIResourceLayer> back_logo_;
   float brightness_;
 
   DISALLOW_COPY_AND_ASSIGN(TabLayer);
 };
 
 }  //  namespace android
 
 #endif  // CHROME_BROWSER_ANDROID_COMPOSITOR_LAYER_TAB_LAYER_H_