Remove redundant reading and writing of data about SharedBuffer.

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

 /*
  * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) 2007 Alp Toker <alp.toker@collabora.co.uk>
  * Copyright (C) 2008, 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.
@@ skipping 24 matching lines @@
 namespace blink {
 
 ImageSource::ImageSource() {}
 
 ImageSource::~ImageSource() {}
 
 size_t ImageSource::ClearCacheExceptFrame(size_t clear_except_frame) {
   return decoder_ ? decoder_->ClearCacheExceptFrame(clear_except_frame) : 0;
 }
 
-PassRefPtr<SharedBuffer> ImageSource::Data() {
-  return decoder_ ? decoder_->Data() : nullptr;
-}
-
 bool ImageSource::SetData(RefPtr<SharedBuffer> data, bool all_data_received) {
   all_data_received_ = all_data_received;
 
   if (decoder_) {
     decoder_->SetData(std::move(data), all_data_received);
     // If the decoder is pre-instantiated, it means we've already validated the
     // data/signature at some point.
     return true;
   }
 
@@ skipping 84 matching lines @@
 
 bool ImageSource::FrameIsCompleteAtIndex(size_t index) const {
   return decoder_ && decoder_->FrameIsCompleteAtIndex(index);
 }
 
 size_t ImageSource::FrameBytesAtIndex(size_t index) const {
   return decoder_ ? decoder_->FrameBytesAtIndex(index) : 0;
 }
 
 }  // namespace blink