[Extensions] Clean up the handling of ExtensionHostMsg_Request

extensions/browser/app_window/test_app_window_contents.h

 // Copyright 2014 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 EXTENSIONS_BROWSER_APP_WINDOW_TEST_APP_WINDOW_CONTENTS_
 #define EXTENSIONS_BROWSER_APP_WINDOW_TEST_APP_WINDOW_CONTENTS_
 
 #include "base/macros.h"
 #include "extensions/browser/app_window/app_window.h"
 
@@ skipping 10 matching lines @@
   explicit TestAppWindowContents(content::WebContents* web_contents);
   ~TestAppWindowContents() override;
 
   // apps:AppWindowContents:
   void Initialize(content::BrowserContext* context, const GURL& url) override;
   void LoadContents(int32 creator_process_id) override;
   void NativeWindowChanged(NativeAppWindow* native_app_window) override;
   void NativeWindowClosed() override;
   void DispatchWindowShownForTests() const override;
   content::WebContents* GetWebContents() const override;
+  WindowController* GetWindowController() const override;
 
  private:
   scoped_ptr<content::WebContents> web_contents_;
 
   DISALLOW_COPY_AND_ASSIGN(TestAppWindowContents);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_APP_WINDOW_TEST_APP_WINDOW_CONTENTS_