blink: Cleanup core class forward declarations

third_party/WebKit/Source/core/html/HTMLVideoElement.h

 /*
  * Copyright (C) 2007, 2008, 2009, 2010 Apple 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 25 matching lines @@
 class SkPaint;
 
 namespace gpu {
 namespace gles2 {
 class GLES2Interface;
 }
 }
 
 namespace blink {
 class ExceptionState;
-class GraphicsContext;
 class ImageBitmapOptions;
 
 class CORE_EXPORT HTMLVideoElement final : public HTMLMediaElement,
                                            public CanvasImageSource,
                                            public ImageBitmapSource {
   DEFINE_WRAPPERTYPEINFO();
 
  public:
   static HTMLVideoElement* create(Document&);
   DECLARE_VIRTUAL_TRACE();
@@ skipping 74 matching lines @@
   void setDisplayMode(DisplayMode) override;
 
   Member<HTMLImageLoader> m_imageLoader;
 
   AtomicString m_defaultPosterURL;
 };
 
 }  // namespace blink
 
 #endif  // HTMLVideoElement_h