Remove SetWrapperReferenceTo and SetWrapperReferenceFrom

third_party/WebKit/Source/modules/webgl/WebGLExtension.h

 /*
  * 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 47 matching lines @@
 
   // Lose this extension. Passing true = force loss. Some extensions
   // like WEBGL_lose_context are not normally lost when the context
   // is lost but must be lost when destroying their WebGLRenderingContextBase.
   virtual void lose(bool) { m_context = nullptr; }
 
   bool isLost() { return !m_context; }
 
   DECLARE_VIRTUAL_TRACE();
 
-  // For use by V8 bindings only.
-  HTMLCanvasElement* canvas() const {
-    if (m_context)
-      return m_context->canvas();
-    return nullptr;
-  }
-
  protected:
   explicit WebGLExtension(WebGLRenderingContextBase*);
 
  private:
   friend WebGLExtensionScopedContext;
 
   WeakMember<WebGLRenderingContextBase> m_context;
 };
 
 }  // namespace blink
 
 #endif  // WebGLExtension_h