remoting: Cleanup class/struct fwd declarations

remoting/host/setup/me2me_native_messaging_host.h

 // Copyright 2013 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 REMOTING_HOST_SETUP_ME2ME_NATIVE_MESSAGING_HOST_H_
 #define REMOTING_HOST_SETUP_ME2ME_NATIVE_MESSAGING_HOST_H_
 
 #include <cstdint>
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/thread_checker.h"
 #include "build/build_config.h"
 #include "extensions/browser/api/messaging/native_message_host.h"
 #include "remoting/host/setup/daemon_controller.h"
 #include "remoting/host/setup/oauth_client.h"
 
 namespace base {
 class DictionaryValue;
 class ListValue;
 class SingleThreadTaskRunner;
 class Value;
 }  // namespace base
 
-namespace gaia {
-class GaiaOAuthClient;
-}  // namespace gaia
-
 namespace remoting {
 
 namespace protocol {
 class PairingRegistry;
 }  // namespace protocol
 
 class ChromotingHostContext;
 class ElevatedNativeMessagingHost;
 class LogMessageHandler;
 
@@ skipping 106 matching lines @@
 
   base::WeakPtr<Me2MeNativeMessagingHost> weak_ptr_;
   base::WeakPtrFactory<Me2MeNativeMessagingHost> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Me2MeNativeMessagingHost);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_SETUP_ME2ME_NATIVE_MESSAGING_HOST_H_