rtc_stats: Update code to remove chromium style warnings suppression.

webrtc/api/rtcstatscollector_unittest.cc

Index: webrtc/api/rtcstatscollector_unittest.cc
diff --git a/webrtc/api/rtcstatscollector_unittest.cc b/webrtc/api/rtcstatscollector_unittest.cc
index 020a759a68ec5a470a66ede1a91555dc4b5f1466..14abbd251a9e58e6e98d8ae03641f8b9e3bc0d69 100644
--- a/webrtc/api/rtcstatscollector_unittest.cc
+++ b/webrtc/api/rtcstatscollector_unittest.cc
@@ -140,17 +140,17 @@ class RTCStatsCollectorTestHelper : public SetSessionDescriptionObserver {
 
 class RTCTestStats : public RTCStats {
  public:
+  WEBRTC_RTCSTATS_DECL();
+
   RTCTestStats(const std::string& id, int64_t timestamp_us)
       : RTCStats(id, timestamp_us),
         dummy_stat("dummyStat") {}
 
-  WEBRTC_RTCSTATS_IMPL(RTCStats, RTCTestStats,
-      &dummy_stat);
-
   RTCStatsMember<int32_t> dummy_stat;
 };
 
-const char RTCTestStats::kType[] = "test-stats";
+WEBRTC_RTCSTATS_IMPL(RTCTestStats, RTCStats, "test-stats",
+    &dummy_stat);
 
 // Overrides the stats collection to verify thread usage and that the resulting
 // partial reports are merged.