Merge 92520 - [chromium] Accelerated canvas breaks when moving canvases or resources between Pages

Source/WebCore/platform/graphics/gpu/mac/DrawingBufferMac.mm

 /*
  * Copyright (C) 2010 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 66 matching lines @@
     
     createSecondaryBuffers();
     reset(size);
 }
 
 DrawingBuffer::~DrawingBuffer()
 {
     clear();
 }
 
-void DrawingBuffer::didReset()
-{
-}
-
 PlatformLayer* DrawingBuffer::platformLayer()
 {
     return m_platformLayer.get();
 }
 
 Platform3DObject DrawingBuffer::platformColorBuffer() const
 {
     return m_colorBuffer;
 }
 
 }
 
 #endif