Replace window.external with a v8::extension.

chrome/renderer/external_js_object.h

-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-/*
-  ExternalJSObject class:
-  Bound to a JavaScript window.external object using
-  CppBoundClass::BindToJavascript(), this adds methods accessible from JS for
-  compatibility with other browsers.
-*/
-
-#ifndef CHROME_RENDERER_EXTERNAL_JS_OBJECT_H__
-#define CHROME_RENDERER_EXTERNAL_JS_OBJECT_H__
-
-#include "base/basictypes.h"
-#include "webkit/glue/cpp_bound_class.h"
-
-class RenderView;
-
-class ExternalJSObject : public CppBoundClass {
- public:
-  // Builds the property and method lists needed to bind this class to a JS
-  // object.
-  ExternalJSObject();
-
-  // A RenderView must be set before AddSearchProvider is called, or the call
-  // will do nothing.
-  void set_render_view(RenderView* rv) { render_view_ = rv; }
-
-  // Given a URL to an OpenSearch document in the first argument, adds the
-  // corresponding search provider as a keyword search.  The nonstandard
-  // capitalization is for compatibility with Firefox and IE.
-  void AddSearchProvider(const CppArgumentList& args, CppVariant* result);
-
- private:
-  RenderView* render_view_;
-
-  DISALLOW_EVIL_CONSTRUCTORS(ExternalJSObject);
-};
-
-#endif  // CHROME_RENDERER_EXTERNAL_JS_OBJECT_H__