Clean up forward declarations in Source/platform

Source/platform/graphics/skia/NativeImageSkia.h

 /*
  * Copyright (c) 2008, 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 24 matching lines @@
 #include "SkRect.h"
 #include "SkSize.h"
 #include "SkXfermode.h"
 #include "platform/PlatformExport.h"
 #include "platform/geometry/IntSize.h"
 #include "platform/graphics/GraphicsTypes.h"
 #include "wtf/Forward.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 
-class SkMatrix;
-class SkPaint;
-
 namespace blink {
 
 class FloatPoint;
 class FloatRect;
 class FloatSize;
 class GraphicsContext;
 
 // This object is used as the "native image" in our port. When WebKit uses
 // PassNativeImagePtr / NativeImagePtr, it is a smart pointer to this type.
 // It has an SkBitmap, and also stores a cached resized image.
@@ skipping 108 matching lines @@
     //
     // We also track scaling information and destination subset for the scaled
     // image. See comments for ImageResourceInfo.
     mutable ImageResourceInfo m_cachedImageInfo;
     mutable int m_resizeRequests;
 };
 
 } // namespace blink
 
 #endif  // NativeImageSkia_h