Remove redundant reading and writing of data about SharedBuffer.

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

 /*
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2008 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
@@ skipping 106 matching lines @@
 }
 
 void BitmapImage::DestroyDecodedData() {
   cached_frame_.reset();
   for (size_t i = 0; i < frames_.size(); ++i)
     frames_[i].Clear(true);
   source_.ClearCacheExceptFrame(kNotFound);
   NotifyMemoryChanged();
 }
 
-PassRefPtr<SharedBuffer> BitmapImage::Data() {
-  return source_.Data();
-}
-
 void BitmapImage::NotifyMemoryChanged() {
   if (GetImageObserver())
     GetImageObserver()->DecodedSizeChangedTo(this, TotalFrameBytes());
 }
 
 size_t BitmapImage::TotalFrameBytes() {
   const size_t num_frames = FrameCount();
   size_t total_bytes = 0;
   for (size_t i = 0; i < num_frames; ++i)
     total_bytes += source_.FrameBytesAtIndex(i);
@@ skipping 502 matching lines @@
 
   return true;
 }
 
 void BitmapImage::NotifyObserversOfAnimationAdvance(TimerBase*) {
   if (GetImageObserver())
     GetImageObserver()->AnimationAdvanced(this);
 }
 
 }  // namespace blink