Remove redundant reading and writing of data about SharedBuffer.

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

Index: third_party/WebKit/Source/platform/graphics/ImageSource.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/ImageSource.cpp b/third_party/WebKit/Source/platform/graphics/ImageSource.cpp
index 38c5eff0816b7dabd56e790555aa360712dc73d5..afd66ad59a8d611a5eb84821dc4c189411e4fcd6 100644
--- a/third_party/WebKit/Source/platform/graphics/ImageSource.cpp
+++ b/third_party/WebKit/Source/platform/graphics/ImageSource.cpp
@@ -42,10 +42,6 @@ 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;