remoting: Cleanup class/struct fwd declarations

remoting/protocol/ice_transport_channel.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_PROTOCOL_ICE_TRANSPORT_CHANNEL_H_
 #define REMOTING_PROTOCOL_ICE_TRANSPORT_CHANNEL_H_
 
 #include <string>
 
 #include "base/callback_forward.h"
@@ skipping 12 matching lines @@
 class Candidate;
 class P2PTransportChannel;
 class PortAllocator;
 class TransportChannel;
 class TransportChannelImpl;
 }  // namespace cricket
 
 namespace remoting {
 namespace protocol {
 
+class P2PDatagramSocket;
 class TransportContext;
 
 class IceTransportChannel : public sigslot::has_slots<> {
  public:
   class Delegate {
    public:
     Delegate() {};
     virtual ~Delegate() {};
 
     // Called to pass ICE credentials to the session. Used only for STANDARD
@@ skipping 88 matching lines @@
 
   base::WeakPtrFactory<IceTransportChannel> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(IceTransportChannel);
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_ICE_TRANSPORT_CHANNEL_H_