Move MainWorldScriptContext accessor/method from WebFrame to WebLocalFrame.

content/renderer/web_ui_extension.h

 // Copyright 2012 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.
 
 #ifndef CONTENT_RENDERER_WEB_UI_EXTENSION_H_
 #define CONTENT_RENDERER_WEB_UI_EXTENSION_H_
 
 #include <string>
 
 #include "base/macros.h"
 
 namespace blink {
-class WebFrame;
+class WebLocalFrame;
 }
 
 namespace gin {
 class Arguments;
 }
 
 namespace content {
 
 class WebUIExtension {
  public:
-  static void Install(blink::WebFrame* frame);
+  static void Install(blink::WebLocalFrame* frame);
 
  private:
   static void Send(gin::Arguments* args);
   static std::string GetVariableValue(const std::string& name);
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(WebUIExtension);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_WEB_UI_EXTENSION_H_