Update QuicTransportChannel to latest version of libquic

webrtc/p2p/quic/reliablequicstream.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 11 matching lines @@
 class ReliableQuicStream : public net::ReliableQuicStream,
                            public sigslot::has_slots<> {
  public:
   ReliableQuicStream(net::QuicStreamId id, net::QuicSession* session);
 
   ~ReliableQuicStream() override;
 
   // ReliableQuicStream overrides.
   void OnDataAvailable() override;
   void OnClose() override;
-  net::SpdyPriority Priority() const override { return 0; }
 
   // Process decrypted data into encrypted QUIC packets, which get sent to the
   // QuicPacketWriter. rtc::SR_BLOCK is returned if the operation blocks instead
   // of writing, in which case the data is queued until OnCanWrite() is called.
   rtc::StreamResult Write(const char* data, size_t len);
 
   // Called when decrypted data is ready to be read.
   sigslot::signal3<net::QuicStreamId, const char*, size_t> SignalDataReceived;
   // Called when stream closed.
   sigslot::signal2<net::QuicStreamId, net::QuicErrorCode> SignalClosed;
 
  private:
   RTC_DISALLOW_COPY_AND_ASSIGN(ReliableQuicStream);
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_P2P_QUIC_RELIABLEQUICSTREAM_H_