content: Cleanup class/struct forward declarations

content/renderer/media/webrtc/peer_connection_dependency_factory.h

 // Copyright 2014 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 CONTENT_RENDERER_MEDIA_WEBRTC_PEER_CONNECTION_DEPENDENCY_FACTORY_H_
 #define CONTENT_RENDERER_MEDIA_WEBRTC_PEER_CONNECTION_DEPENDENCY_FACTORY_H_
 
 #include <string>
 
 #include "base/files/file.h"
@@ skipping 10 matching lines @@
 
 namespace base {
 class WaitableEvent;
 }
 
 namespace media {
 class GpuVideoAcceleratorFactories;
 }
 
 namespace rtc {
-class NetworkManager;
-class PacketSocketFactory;
 class Thread;
 }
 
 namespace blink {
 class WebFrame;
-class WebMediaStream;
 class WebRTCPeerConnectionHandler;
 class WebRTCPeerConnectionHandlerClient;
 }
 
 namespace content {
 
 class IpcNetworkManager;
 class IpcPacketSocketFactory;
 class WebRtcAudioDeviceImpl;
 
@@ skipping 106 matching lines @@
   rtc::Thread* worker_thread_;
   base::Thread chrome_signaling_thread_;
   base::Thread chrome_worker_thread_;
 
   DISALLOW_COPY_AND_ASSIGN(PeerConnectionDependencyFactory);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_WEBRTC_PEER_CONNECTION_DEPENDENCY_FACTORY_H_