Re-land "WebGL: Transfer ownership of WebGraphicsContext3D to DrawingBuffer"

Source/core/html/canvas/WebGLContextObject.cpp

 /*
  * Copyright (C) 2011 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 29 matching lines @@
 WebGLContextObject::~WebGLContextObject()
 {
     if (m_context)
         m_context->removeContextObject(this);
 }
 
 void WebGLContextObject::detachContext()
 {
     detach();
     if (m_context) {
-        deleteObject(m_context->webGraphicsContext3D());
+        deleteObject(m_context->webContext());
         m_context->removeContextObject(this);
         m_context = 0;
     }
 }
 
 blink::WebGraphicsContext3D* WebGLContextObject::getAWebGraphicsContext3D() const
 {
-    return m_context ? m_context->webGraphicsContext3D() : 0;
+    return m_context ? m_context->webContext() : 0;
 }
 
 }