Remove redundant reading and writing of data about SharedBuffer.

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

 /*
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) 2008-2009 Torch Mobile, Inc.
  *
  * 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.
@@ skipping 121 matching lines @@
 
   // Returns the total number of bytes allocated for all framebuffers, i.e.
   // the sum of m_source.frameBytesAtIndex(...) for all frames.
   size_t TotalFrameBytes();
 
   // Called to wipe out the entire frame buffer cache and tell the image
   // source to destroy everything; this is used when e.g. we want to free
   // some room in the image cache.
   void DestroyDecodedData() override;
 
-  PassRefPtr<SharedBuffer> Data() override;
-
   // Notifies observers that the memory footprint has changed.
   void NotifyMemoryChanged();
 
   // Whether or not size is available yet.
   bool IsSizeAvailable();
 
   // Animation.
   // We start and stop animating lazily.  Animation starts when the image is
   // rendered, and automatically stops once no observer wants to render the
   // image.
@@ skipping 65 matching lines @@
   size_t frame_count_;
 
   RefPtr<WebTaskRunner> task_runner_;
 };
 
 DEFINE_IMAGE_TYPE_CASTS(BitmapImage);
 
 }  // namespace blink
 
 #endif