Make WebGL extensions get lost when context is lost.

Source/core/html/canvas/WebGLDebugRendererInfo.cpp

 /*
  * Copyright (C) 2011 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 26 matching lines @@
 
 WebGLDebugRendererInfo::~WebGLDebugRendererInfo()
 {
 }
 
 WebGLExtension::ExtensionName WebGLDebugRendererInfo::getName() const
 {
     return WebGLDebugRendererInfoName;
 }
 
-PassOwnPtr<WebGLDebugRendererInfo> WebGLDebugRendererInfo::create(WebGLRenderingContext* context)
+PassRefPtr<WebGLDebugRendererInfo> WebGLDebugRendererInfo::create(WebGLRenderingContext* context)
 {
-    return adoptPtr(new WebGLDebugRendererInfo(context));
+    return adoptRef(new WebGLDebugRendererInfo(context));
 }
 
 bool WebGLDebugRendererInfo::supported(WebGLRenderingContext*)
 {
     return true;
 }
 
 const char* WebGLDebugRendererInfo::getExtensionName()
 {
     return "WEBGL_debug_renderer_info";
 }
 
 } // namespace WebCore