Delete final remnants of the buzz namespace.

webrtc/p2p/base/transportchannelimpl.h

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #ifndef WEBRTC_P2P_BASE_TRANSPORTCHANNELIMPL_H_
 #define WEBRTC_P2P_BASE_TRANSPORTCHANNELIMPL_H_
 
 #include <string>
 
 #include "webrtc/base/constructormagic.h"
 #include "webrtc/p2p/base/transportchannel.h"
 
-namespace buzz { class XmlElement; }
-
 namespace webrtc {
 class MetricsObserverInterface;
 }
 
 namespace cricket {
 
 class Candidate;
 
 // TODO(pthatcher): Remove this once it's no longer used in
 // remoting/protocol/libjingle_transport_factory.cc
@@ skipping 90 matching lines @@
   // Emitted whenever the Dtls handshake failed on some transport channel.
   sigslot::signal1<rtc::SSLHandshakeError> SignalDtlsHandshakeError;
 
  private:
   RTC_DISALLOW_COPY_AND_ASSIGN(TransportChannelImpl);
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_P2P_BASE_TRANSPORTCHANNELIMPL_H_