Revert of New PeerConnectionInterface::GetStats: No bogus default implementation.

webrtc/api/peerconnectioninterface.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 456 matching lines @@
   virtual std::vector<rtc::scoped_refptr<RtpReceiverInterface>> GetReceivers()
       const {
     return std::vector<rtc::scoped_refptr<RtpReceiverInterface>>();
   }
 
   virtual bool GetStats(StatsObserver* observer,
                         MediaStreamTrackInterface* track,
                         StatsOutputLevel level) = 0;
   // Gets stats using the new stats collection API, see webrtc/api/stats/. These
   // will replace old stats collection API when the new API has matured enough.
-  // Master bug: crbug.com/627816
-  virtual void GetStats(RTCStatsCollectorCallback* callback) = 0;
+  // TODO(hbos): Default implementation that does nothing only exists as to not
+  // break third party projects. As soon as they have been updated this should
+  // be changed to "= 0;".
+  virtual void GetStats(RTCStatsCollectorCallback* callback) {}
 
   virtual rtc::scoped_refptr<DataChannelInterface> CreateDataChannel(
       const std::string& label,
       const DataChannelInit* config) = 0;
 
   virtual const SessionDescriptionInterface* local_description() const = 0;
   virtual const SessionDescriptionInterface* remote_description() const = 0;
 
   // Create a new offer.
   // The CreateSessionDescriptionObserver callback will be called when done.
@@ skipping 322 matching lines @@
     cricket::WebRtcVideoEncoderFactory* encoder_factory,
     cricket::WebRtcVideoDecoderFactory* decoder_factory) {
   return CreatePeerConnectionFactory(
       worker_and_network_thread, worker_and_network_thread, signaling_thread,
       default_adm, encoder_factory, decoder_factory);
 }
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_API_PEERCONNECTIONINTERFACE_H_