blink: Cleanup class forward declarations

third_party/WebKit/Source/platform/graphics/ImageBufferSurface.h

 /*
  * Copyright (c) 2013, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 23 matching lines @@
 #include "platform/PlatformExport.h"
 #include "platform/geometry/IntSize.h"
 #include "platform/graphics/GraphicsTypes.h"
 #include "third_party/khronos/GLES2/gl2.h"
 #include "third_party/skia/include/core/SkImageInfo.h"
 #include "third_party/skia/include/core/SkPaint.h"
 #include "third_party/skia/include/core/SkRefCnt.h"
 #include "wtf/Allocator.h"
 #include "wtf/Noncopyable.h"
 
-class SkBitmap;
 class SkCanvas;
 class SkColorSpace;
 class SkImage;
 struct SkImageInfo;
 class SkPicture;
 
 namespace blink {
 
 class ImageBuffer;
 class WebLayer;
@@ skipping 63 matching lines @@
  private:
   OpacityMode m_opacityMode;
   IntSize m_size;
   sk_sp<SkColorSpace> m_colorSpace;
   SkColorType m_colorType;
 };
 
 }  // namespace blink
 
 #endif