Rename RTCOutboundRTPStreamStats *_rtt members to *_round_trip_time.

webrtc/api/rtcstats_integrationtest.cc

Index: webrtc/api/rtcstats_integrationtest.cc
diff --git a/webrtc/api/rtcstats_integrationtest.cc b/webrtc/api/rtcstats_integrationtest.cc
index 0f60377eb221b39c626ea2624bcfa33c3a2e5b93..d4abd4819934b4c1f0c35e186f70fe51d97862d1 100644
--- a/webrtc/api/rtcstats_integrationtest.cc
+++ b/webrtc/api/rtcstats_integrationtest.cc
@@ -334,8 +334,8 @@ class RTCStatsReportVerifier {
     verifier.TestMemberIsUndefined(candidate_pair.readable);
     verifier.TestMemberIsDefined(candidate_pair.bytes_sent);
     verifier.TestMemberIsDefined(candidate_pair.bytes_received);
-    verifier.TestMemberIsUndefined(candidate_pair.total_rtt);
-    verifier.TestMemberIsDefined(candidate_pair.current_rtt);
+    verifier.TestMemberIsUndefined(candidate_pair.total_round_trip_time);
+    verifier.TestMemberIsDefined(candidate_pair.current_round_trip_time);
     verifier.TestMemberIsUndefined(candidate_pair.available_outgoing_bitrate);
     verifier.TestMemberIsUndefined(candidate_pair.available_incoming_bitrate);
     verifier.TestMemberIsDefined(candidate_pair.requests_received);