Reland the CL to remove candidates when doing continual gathering

webrtc/p2p/base/faketransportcontroller.h

 /*
  *  Copyright 2009 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 198 matching lines @@
     SignalSentPacket(this, sent_packet);
     return static_cast<int>(len);
   }
   int SetOption(rtc::Socket::Option opt, int value) override { return true; }
   bool GetOption(rtc::Socket::Option opt, int* value) override { return true; }
   int GetError() override { return 0; }
 
   void AddRemoteCandidate(const Candidate& candidate) override {
     remote_candidates_.push_back(candidate);
   }
+
+  void RemoveRemoteCandidate(const Candidate& candidate) override {}
+
   const Candidates& remote_candidates() const { return remote_candidates_; }
 
   void OnMessage(rtc::Message* msg) override {
     PacketMessageData* data = static_cast<PacketMessageData*>(msg->pdata);
     dest_->SignalReadPacket(dest_, data->packet.data<char>(),
                             data->packet.size(), rtc::CreatePacketTime(0), 0);
     delete data;
   }
 
   bool SetLocalCertificate(
@@ skipping 298 matching lines @@
     }
   }
 
  private:
   bool fail_create_channel_;
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_P2P_BASE_FAKETRANSPORTCONTROLLER_H_