blink: Cleanup class forward declarations

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

 /*
  * Copyright (C) 2012 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 23 matching lines @@
 #include "wtf/Allocator.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
 #include "wtf/ThreadSafeRefCounted.h"
 #include "wtf/ThreadingPrimitives.h"
 #include "wtf/Vector.h"
 #include <memory>
 
-class SkData;
 struct SkYUVSizeInfo;
 
 namespace blink {
 
 class ImageDecoder;
 
 class PLATFORM_EXPORT ImageDecoderFactory {
   USING_FAST_MALLOC(ImageDecoderFactory);
   WTF_MAKE_NONCOPYABLE(ImageDecoderFactory);
 
@@ skipping 94 matching lines @@
   // Prevents multiple decode operations on the same data.
   Mutex m_decodeMutex;
 
   // Protect concurrent access to m_hasAlpha.
   Mutex m_alphaMutex;
 };
 
 }  // namespace blink
 
 #endif