Refactor media stream infobar delegate code and also fix a typo

chrome/browser/ui/gtk/infobars/media_stream_infobar_gtk.h

 // Copyright (c) 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 CHROME_BROWSER_UI_GTK_INFOBARS_MEDIA_STREAM_INFOBAR_GTK_H_
 #define CHROME_BROWSER_UI_GTK_INFOBARS_MEDIA_STREAM_INFOBAR_GTK_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "chrome/browser/ui/gtk/infobars/infobar_gtk.h"
@@ skipping 10 matching lines @@
 
   // Initializes the infobar widgets. Should be called after the object has been
   // created.
   virtual void Init();
 
  private:
   CHROMEGTK_CALLBACK_0(MediaStreamInfoBarGtk, void, OnAllowButton);
   CHROMEGTK_CALLBACK_0(MediaStreamInfoBarGtk, void, OnDenyButton);
   CHROMEGTK_CALLBACK_0(MediaStreamInfoBarGtk, void, OnDevicesClicked);
 
-  // Convenience to retrieve the MediaStreamInfobarDelegate for this infobar.
-  MediaStreamInfoBarDelegate* delegate_;
+  MediaStreamInfoBarDelegate* GetDelegate();
 
   MediaStreamDevicesMenuModel* devices_menu_model_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamInfoBarGtk);
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_INFOBARS_MEDIA_STREAM_INFOBAR_GTK_H_