remoting: Cleanup class/struct fwd declarations

remoting/test/test_chromoting_client.h

 // Copyright 2015 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_TEST_TEST_CHROMOTING_CLIENT_H_
 #define REMOTING_TEST_TEST_CHROMOTING_CLIENT_H_
 
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/observer_list.h"
 #include "remoting/client/chromoting_client.h"
 #include "remoting/client/client_user_interface.h"
 #include "remoting/protocol/clipboard_filter.h"
 #include "remoting/protocol/cursor_shape_stub.h"
 #include "remoting/test/remote_connection_observer.h"
 
 namespace remoting {
 
 class ClientContext;
-class XmppSignalStrategy;
 
 namespace protocol {
 class ClipboardStub;
 class HostStub;
 class InputStub;
 class VideoRenderer;
 }  // namespace protocol
 
 namespace test {
 
@@ skipping 89 matching lines @@
   // SignalStrategy used for connection signaling.
   std::unique_ptr<SignalStrategy> signal_strategy_;
 
   DISALLOW_COPY_AND_ASSIGN(TestChromotingClient);
 };
 
 }  // namespace test
 }  // namespace remoting
 
 #endif  // REMOTING_TEST_TEST_CHROMOTING_CLIENT_H_