rtc_stats: Update code to remove chromium style warnings suppression.

webrtc/api/stats/rtcstats_objects.h

Index: webrtc/api/stats/rtcstats_objects.h
diff --git a/webrtc/api/stats/rtcstats_objects.h b/webrtc/api/stats/rtcstats_objects.h
index ac480a937b0bd6d0178e668d2eb2678c5f5d8bc7..a3c6fe901bbc03faa7de5d53071039ace213e75c 100644
--- a/webrtc/api/stats/rtcstats_objects.h
+++ b/webrtc/api/stats/rtcstats_objects.h
@@ -21,10 +21,10 @@ class RTCPeerConnectionStats : public RTCStats {
  public:
   RTCPeerConnectionStats(const std::string& id, int64_t timestamp_us);
   RTCPeerConnectionStats(std::string&& id, int64_t timestamp_us);
+  RTCPeerConnectionStats(const RTCPeerConnectionStats& other);
+  ~RTCPeerConnectionStats() override;
 
-  WEBRTC_RTCSTATS_IMPL(RTCStats, RTCPeerConnectionStats,
-      &data_channels_opened,
-      &data_channels_closed);
+  WEBRTC_RTCSTATS_DECL();
 
   RTCStatsMember<uint32_t> data_channels_opened;
   RTCStatsMember<uint32_t> data_channels_closed;