blink: Cleanup class/struct forward declarations

third_party/WebKit/public/platform/WebImageLayer.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
@@ skipping 11 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef WebImageLayer_h
 #define WebImageLayer_h
 
 #include "WebCommon.h"
 #include "WebLayer.h"
 
-class SkBitmap;
 class SkImage;
 
 namespace blink {
 
 class WebImageLayer {
  public:
   virtual ~WebImageLayer() {}
 
   virtual WebLayer* layer() = 0;
   virtual void setImage(const SkImage*) = 0;
   virtual void setNearestNeighbor(bool) = 0;
 };
 
 }  // namespace blink
 
 #endif  // WebImageLayer_h