rtc_stats: Update code to remove chromium style warnings suppression.

webrtc/stats/rtcstats_objects.cc

Index: webrtc/stats/rtcstats_objects.cc
diff --git a/webrtc/stats/rtcstats_objects.cc b/webrtc/stats/rtcstats_objects.cc
index c435908dc461fb3c692898d84bfce4c3d4a8dc35..3069146bd3d408a000429ae61b0f9e94343799a4 100644
--- a/webrtc/stats/rtcstats_objects.cc
+++ b/webrtc/stats/rtcstats_objects.cc
@@ -12,7 +12,9 @@
 
 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)
@@ -26,4 +28,14 @@ RTCPeerConnectionStats::RTCPeerConnectionStats(
       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