Revert of Modified PeerConnection and WebRtcSession for end-to-end QuicDataChannel usage.

webrtc/p2p/quic/quictransportchannel.h

 /*
  *  Copyright 2016 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.
  */
 
@@ skipping 193 matching lines @@
   // Returns true if |quic_| has queued data which wasn't written due
   // to |channel_| being write blocked.
   bool HasDataToWrite() const;
   // Writes queued data for |quic_| when |channel_| is no longer write blocked.
   void OnCanWrite();
   // Connectivity state of QuicTransportChannel.
   QuicTransportState quic_state() const { return quic_state_; }
   // Creates a new QUIC stream that can send data.
   ReliableQuicStream* CreateQuicStream();
 
-  TransportChannelImpl* ice_transport_channel() { return channel_.get(); }
-
   // Emitted when |quic_| creates a QUIC stream to receive data from the remote
   // peer, when the stream did not exist previously.
   sigslot::signal1<ReliableQuicStream*> SignalIncomingStream;
   // Emitted when the QuicTransportChannel state becomes QUIC_TRANSPORT_CLOSED.
   sigslot::signal0<> SignalClosed;
 
  private:
   // Fingerprint of remote peer.
   struct RemoteFingerprint {
     std::string value;
@@ skipping 71 matching lines @@
   rtc::scoped_refptr<rtc::RTCCertificate> local_certificate_;
   // Fingerprint of the remote peer. This must be set before we start QUIC.
   rtc::Optional<RemoteFingerprint> remote_fingerprint_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(QuicTransportChannel);
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_P2P_QUIC_QUICTRANSPORTCHANNEL_H_