blink: Cleanup class forward declarations

third_party/WebKit/Source/platform/graphics/Canvas2DLayerBridge.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 38 matching lines @@
 class SkPictureRecorder;
 
 namespace gpu {
 namespace gles2 {
 class GLES2Interface;
 }
 }
 
 namespace blink {
 
-class Canvas2DLayerBridgeHistogramLogger;
 class Canvas2DLayerBridgeTest;
 class ImageBuffer;
 class WebGraphicsContext3DProvider;
 class SharedContextRateLimiter;
 
 #if OS(MACOSX)
 // Canvas hibernation is currently disabled on MacOS X due to a bug that causes
 // content loss. TODO: Find a better fix for crbug.com/588434
 #define CANVAS2D_HIBERNATION_ENABLED 0
 
@@ skipping 224 matching lines @@
   // Each element in this vector represents an IOSurface backed texture that
   // is ready to be reused.
   // Elements in this vector can safely be purged in low memory conditions.
   Vector<RefPtr<ImageInfo>> m_imageInfoCache;
 #endif  // USE_IOSURFACE_FOR_2D_CANVAS
 };
 
 }  // namespace blink
 
 #endif