[Oilpan] Migrate classes under module/webgl onto oilpan heap

Source/modules/webgl/WebGLExtension.cpp

 /*
  * Copyright (C) 2010 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 20 matching lines @@
 
 WebGLExtensionScopedContext::WebGLExtensionScopedContext(WebGLExtension* extension)
     : m_context(extension->m_context)
 {
 }
 
 WebGLExtensionScopedContext::~WebGLExtensionScopedContext()
 {
 }
 
-DEFINE_TRACE(WebGLExtensionScopedContext)
-{
-    visitor->trace(m_context);
-}
-
-
 WebGLExtension::WebGLExtension(WebGLRenderingContextBase* context)
     : m_context(context)
 {
 }
 
 WebGLExtension::~WebGLExtension()
 {
 }
 
 DEFINE_TRACE(WebGLExtension)
 {
     visitor->trace(m_context);
 }
 
 } // namespace blink