Remove redundant reading and writing of data about SharedBuffer.

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

Index: third_party/WebKit/Source/platform/graphics/DeferredImageDecoder.h
diff --git a/third_party/WebKit/Source/platform/graphics/DeferredImageDecoder.h b/third_party/WebKit/Source/platform/graphics/DeferredImageDecoder.h
index 73eafe8a1b0ddf726c6e12971a7371f2d0a9a968..257e69a7c8153b2ccdc6fcf50c7d442bd03f6afc 100644
--- a/third_party/WebKit/Source/platform/graphics/DeferredImageDecoder.h
+++ b/third_party/WebKit/Source/platform/graphics/DeferredImageDecoder.h
@@ -28,10 +28,12 @@
 
 #include <memory>
 #include "platform/PlatformExport.h"
+#include "platform/SharedBuffer.h"
 #include "platform/geometry/IntSize.h"
 #include "platform/image-decoders/ImageDecoder.h"
 #include "platform/wtf/Allocator.h"
 #include "platform/wtf/Forward.h"
+#include "platform/wtf/RefPtr.h"
 #include "platform/wtf/Vector.h"
 #include "third_party/skia/include/core/SkRWBuffer.h"
 #include "third_party/skia/include/core/SkRefCnt.h"
@@ -91,13 +93,13 @@ class PLATFORM_EXPORT DeferredImageDecoder final {
 
   sk_sp<SkImage> CreateFrameImageAtIndex(size_t index, bool known_to_be_opaque);
 
-  void SetDataInternal(RefPtr<SharedBuffer> data,
+  void SetDataInternal(PassRefPtr<SharedBuffer> data,
                        bool all_data_received,
                        bool push_data_to_decoder);
 
   // Copy of the data that is passed in, used by deferred decoding.
   // Allows creating readonly snapshots that may be read in another thread.
-  std::unique_ptr<SkRWBuffer> rw_buffer_;
+  RefPtr<SharedBuffer> buffer_;
   std::unique_ptr<ImageDecoder> actual_decoder_;
 
   String filename_extension_;