rtc_stats: Update code to remove chromium style warnings suppression.

webrtc/stats/rtcstats_objects.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.
  */
 
 #include "webrtc/api/stats/rtcstats_objects.h"
 
 namespace webrtc {
 
-const char RTCPeerConnectionStats::kType[] = "peer-connection";
+WEBRTC_RTCSTATS_IMPL(RTCPeerConnectionStats, RTCStats, "peer-connection",
+    &data_channels_opened,
+    &data_channels_closed);
 
 RTCPeerConnectionStats::RTCPeerConnectionStats(
     const std::string& id, int64_t timestamp_us)
     : RTCPeerConnectionStats(std::string(id), timestamp_us) {
 }
 
 RTCPeerConnectionStats::RTCPeerConnectionStats(
     std::string&& id, int64_t timestamp_us)
     : RTCStats(std::move(id), timestamp_us),
       data_channels_opened("dataChannelsOpened"),
       data_channels_closed("dataChannelsClosed") {
 }
 
+RTCPeerConnectionStats::RTCPeerConnectionStats(
+    const RTCPeerConnectionStats& other)
+    : RTCStats(other.id(), other.timestamp_us()),
+      data_channels_opened(other.data_channels_opened),
+      data_channels_closed(other.data_channels_closed) {
+}
+
+RTCPeerConnectionStats::~RTCPeerConnectionStats() {
+}
+
 }  // namespace webrtc