Revert of Modify PeerConnection for end-to-end QuicDataChannel usage

webrtc/api/quicdatatransport.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 18 matching lines @@
 
 // QuicDataTransport creates QuicDataChannels for the PeerConnection. It also
 // handles QUIC stream demuxing by distributing incoming QUIC streams from the
 // QuicTransportChannel among the QuicDataChannels that it has created.
 //
 // QuicDataTransport reads the data channel ID from the incoming QUIC stream,
 // then looks it up in a map of ID => QuicDataChannel. If the data channel
 // exists, it sends the QUIC stream to the QuicDataChannel.
 class QuicDataTransport : public sigslot::has_slots<> {
  public:
-  QuicDataTransport(rtc::Thread* signaling_thread,
-                    rtc::Thread* worker_thread,
-                    rtc::Thread* network_thread);
+  QuicDataTransport(rtc::Thread* signaling_thread, rtc::Thread* worker_thread);
   ~QuicDataTransport() override;
 
   // Sets the QUIC transport channel for the QuicDataChannels and the
   // QuicDataTransport. Returns false if a different QUIC transport channel is
   // already set, the QUIC transport channel cannot be set for any of the
   // QuicDataChannels, or |channel| is NULL.
   bool SetTransportChannel(cricket::QuicTransportChannel* channel);
 
   // Creates a QuicDataChannel that uses this QuicDataTransport.
   rtc::scoped_refptr<DataChannelInterface> CreateDataChannel(
@@ skipping 23 matching lines @@
                       size_t len);
 
   // Map of data channel ID => QUIC data channel values.
   std::unordered_map<int, rtc::scoped_refptr<QuicDataChannel>>
       data_channel_by_id_;
   // Map of QUIC stream ID => ReliableQuicStream* values.
   std::unordered_map<net::QuicStreamId, cricket::ReliableQuicStream*>
       quic_stream_by_id_;
   // QuicTransportChannel for sending/receiving data.
   cricket::QuicTransportChannel* quic_transport_channel_ = nullptr;
-  // Threads for the QUIC data channel.
+  // Signaling and worker threads for the QUIC data channel.
   rtc::Thread* const signaling_thread_;
   rtc::Thread* const worker_thread_;
-  rtc::Thread* const network_thread_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_API_QUICDATATRANSPORT_H_