Delete obviously unneeded forward declarations in chrome/browser/*.h.

chrome/browser/external_protocol_handler.h

-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 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_EXTERNAL_PROTOCOL_HANDLER_H_
 #define CHROME_BROWSER_EXTERNAL_PROTOCOL_HANDLER_H_
 #pragma once
 
 #include <string>
 
 class DictionaryValue;
 class GURL;
-class MessageLoop;
 class PrefService;
 
 class ExternalProtocolHandler {
  public:
   enum BlockState {
     DONT_BLOCK,
     BLOCK,
     UNKNOWN,
   };
 
@@ skipping 46 matching lines @@
   static void PrepopulateDictionary(DictionaryValue* win_pref);
 
   // Allows LaunchUrl to proceed with launching an external protocol handler.
   // This is typically triggered by a user gesture, but is also called for
   // each extension API function. Note that each call to LaunchUrl resets
   // the state to false (not allowed).
   static void PermitLaunchUrl();
 };
 
 #endif  // CHROME_BROWSER_EXTERNAL_PROTOCOL_HANDLER_H_