Removing getBackingTextureImage from ImageBufferSurface

Source/platform/graphics/Canvas2DLayerBridge.cpp

 /*
  * Copyright (C) 2012 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.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 495 matching lines @@
     Canvas2DLayerManager::get().layerDidDraw(this);
 }
 
 void Canvas2DLayerBridge::finalizeFrame(const FloatRect &dirtyRect)
 {
     ASSERT(!m_destructionInProgress);
     m_layer->layer()->invalidateRect(enclosingIntRect(dirtyRect));
     m_didRecordDrawCommand = true;
 }
 
-PassRefPtr<SkImage> Canvas2DLayerBridge::getBackingTextureImage()
-{
-    if (!checkSurfaceValid())
-        return nullptr;
-
-    context()->flush();
-
-    return adoptRef(m_canvas->newImageSnapshot());
-}
-
 PassRefPtr<SkImage> Canvas2DLayerBridge::newImageSnapshot()
 {
+    if (!checkSurfaceValid())
+        return nullptr;
     return adoptRef(m_canvas->newImageSnapshot());
 }
 
 Canvas2DLayerBridge::MailboxInfo::MailboxInfo(const MailboxInfo& other) {
     memcpy(&m_mailbox, &other.m_mailbox, sizeof(m_mailbox));
     m_image = other.m_image;
     m_parentLayerBridge = other.m_parentLayerBridge;
 }
 
 } // namespace blink