Revert of Remove the obsolete enum webrtc::PeerConnectionInterface::IceState.

webrtc/api/peerconnection.h

 /*
  *  Copyright 2012 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 87 matching lines @@
 
   rtc::scoped_refptr<DataChannelInterface> CreateDataChannel(
       const std::string& label,
       const DataChannelInit* config) override;
   bool GetStats(StatsObserver* observer,
                 webrtc::MediaStreamTrackInterface* track,
                 StatsOutputLevel level) override;
 
   SignalingState signaling_state() override;
 
+  // TODO(bemasc): Remove ice_state() when callers are removed.
+  IceState ice_state() override;
   IceConnectionState ice_connection_state() override;
   IceGatheringState ice_gathering_state() override;
 
   const SessionDescriptionInterface* local_description() const override;
   const SessionDescriptionInterface* remote_description() const override;
 
   // JSEP01
   // Deprecated, use version without constraints.
   void CreateOffer(CreateSessionDescriptionObserver* observer,
                    const MediaConstraintsInterface* constraints) override;
@@ skipping 254 matching lines @@
   // Storing the factory as a scoped reference pointer ensures that the memory
   // in the PeerConnectionFactoryImpl remains available as long as the
   // PeerConnection is running. It is passed to PeerConnection as a raw pointer.
   // However, since the reference counting is done in the
   // PeerConnectionFactoryInterface all instances created using the raw pointer
   // will refer to the same reference count.
   rtc::scoped_refptr<PeerConnectionFactory> factory_;
   PeerConnectionObserver* observer_;
   UMAObserver* uma_observer_;
   SignalingState signaling_state_;
+  // TODO(bemasc): Remove ice_state_.
+  IceState ice_state_;
   IceConnectionState ice_connection_state_;
   IceGatheringState ice_gathering_state_;
 
   std::unique_ptr<cricket::PortAllocator> port_allocator_;
   std::unique_ptr<MediaControllerInterface> media_controller_;
 
   // One PeerConnection has only one RTCP CNAME.
   // https://tools.ietf.org/html/draft-ietf-rtcweb-rtp-usage-26#section-4.9
   std::string rtcp_cname_;
 
@@ skipping 24 matching lines @@
       rtc::scoped_refptr<RtpReceiverProxyWithInternal<RtpReceiverInternal>>>
       receivers_;
 
   std::unique_ptr<WebRtcSession> session_;
   std::unique_ptr<StatsCollector> stats_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_API_PEERCONNECTION_H_