Cleanup: Remove unneeded forward declarations in base, dbug, gpu, ipc, jingle, and media.

jingle/notifier/communicator/login.h

 // Copyright (c) 2011 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 JINGLE_NOTIFIER_COMMUNICATOR_LOGIN_H_
 #define JINGLE_NOTIFIER_COMMUNICATOR_LOGIN_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time.h"
 #include "base/timer.h"
 #include "jingle/notifier/base/server_information.h"
 #include "jingle/notifier/communicator/single_login_attempt.h"
 #include "net/base/network_change_notifier.h"
 #include "talk/xmpp/xmppengine.h"
 
 namespace buzz {
 class XmppClient;
-class XmppEngine;
 class XmppClientSettings;
 class XmppTaskParentInterface;
 }  // namespace buzz
 
 namespace net {
 class URLRequestContextGetter;
 }  // namespace net
 
 namespace notifier {
 
@@ skipping 77 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(Login);
 };
 
 // Workaround for MSVS 2005 bug that fails to handle inheritance from a nested
 // class properly if it comes directly on a base class list.
 typedef Login::Delegate LoginDelegate;
 
 }  // namespace notifier
 
 #endif  // JINGLE_NOTIFIER_COMMUNICATOR_LOGIN_H_