Refactor media stream infobar delegate code and also fix a typo

chrome/browser/infobars/infobar_delegate.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_INFOBARS_INFOBAR_DELEGATE_H_
 #define CHROME_BROWSER_INFOBARS_INFOBAR_DELEGATE_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/string16.h"
@@ skipping 82 matching lines @@
 
   // Returns the type of the infobar.  The type determines the appearance (such
   // as background color) of the infobar.
   virtual Type GetInfoBarType() const;
 
   // Type-checking downcast routines:
   virtual ConfirmInfoBarDelegate* AsConfirmInfoBarDelegate();
   virtual ExtensionInfoBarDelegate* AsExtensionInfoBarDelegate();
   virtual InsecureContentInfoBarDelegate* AsInsecureContentInfoBarDelegate();
   virtual LinkInfoBarDelegate* AsLinkInfoBarDelegate();
-  virtual MediaStreamInfoBarDelegate* AsMediaStreamInfobarDelegate();
+  virtual MediaStreamInfoBarDelegate* AsMediaStreamInfoBarDelegate();
   virtual RegisterProtocolHandlerInfoBarDelegate*
       AsRegisterProtocolHandlerInfoBarDelegate();
   virtual ThemeInstalledInfoBarDelegate* AsThemePreviewInfobarDelegate();
   virtual TranslateInfoBarDelegate* AsTranslateInfoBarDelegate();
 
  protected:
   // If |contents| is non-NULL, its active entry's unique ID will be stored
   // using StoreActiveEntryUniqueID automatically.
   explicit InfoBarDelegate(InfoBarTabHelper* infobar_helper);
 
@@ skipping 15 matching lines @@
   // opened for. Used to help expire on navigations.
   int contents_unique_id_;
 
   // TODO(pkasting): Remove.
   InfoBarTabHelper* owner_;
 
   DISALLOW_COPY_AND_ASSIGN(InfoBarDelegate);
 };
 
 #endif  // CHROME_BROWSER_INFOBARS_INFOBAR_DELEGATE_H_