Revert of RTCInboundRTPStreamStats.qpSum collected.

webrtc/pc/rtcstatscollector.cc

 /*
  *  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 227 matching lines @@
         RTCCodecStatsIDFromDirectionMediaAndPayload(
             true, false, *video_receiver_info.codec_payload_type);
   }
   inbound_video->fir_count =
       static_cast<uint32_t>(video_receiver_info.firs_sent);
   inbound_video->pli_count =
       static_cast<uint32_t>(video_receiver_info.plis_sent);
   inbound_video->nack_count =
       static_cast<uint32_t>(video_receiver_info.nacks_sent);
   inbound_video->frames_decoded = video_receiver_info.frames_decoded;
-  if (video_receiver_info.qp_sum)
-    inbound_video->qp_sum = *video_receiver_info.qp_sum;
 }
 
 // Provides the media independent counters (both audio and video).
 void SetOutboundRTPStreamStatsFromMediaSenderInfo(
     const cricket::MediaSenderInfo& media_sender_info,
     RTCOutboundRTPStreamStats* outbound_stats) {
   RTC_DCHECK(outbound_stats);
   outbound_stats->ssrc = media_sender_info.ssrc();
   // TODO(hbos): Support the remote case. crbug.com/657856
   outbound_stats->is_remote = false;
@@ skipping 986 matching lines @@
     const std::string& type) {
   return CandidateTypeToRTCIceCandidateType(type);
 }
 
 const char* DataStateToRTCDataChannelStateForTesting(
     DataChannelInterface::DataState state) {
   return DataStateToRTCDataChannelState(state);
 }
 
 }  // namespace webrtc