V2 app support step2 : Use NativeAppWindow for Activity's window.

athena/content/shell/shell_app_activity.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 ATHENA_CONTENT_SHELL_SHELL_APP_ACTIVITY_H_
 #define ATHENA_CONTENT_SHELL_SHELL_APP_ACTIVITY_H_
 
 #include "athena/content/app_activity.h"
 
 #include "base/memory/scoped_ptr.h"
 
 namespace extensions {
 class ShellAppWindow;
 }
 
 namespace athena {
 
 class ShellAppActivity : public AppActivity {
  public:
   ShellAppActivity(extensions::ShellAppWindow* app_window,
                    const std::string& app_id);
   virtual ~ShellAppActivity();
 
  private:
+  // ActivityViewModel:
+  virtual views::Widget* CreateWidget() OVERRIDE;
+
   // AppActivity:
-  virtual content::WebContents* GetWebContents() OVERRIDE;
+  virtual views::WebView* GetWebView() OVERRIDE;
 
   scoped_ptr<extensions::ShellAppWindow> shell_app_window_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellAppActivity);
 };
 
 }  // namespace athena
 
 #endif  // ATHENA_CONTENT_SHELL_SHELL_APP_ACTIVITY_H_