Rename RTCOutboundRTPStreamStats *_rtt members to *_round_trip_time.

webrtc/api/rtcstatscollector_unittest.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.
  */
 
@@ skipping 1025 matching lines @@
                                          report->timestamp_us());
   expected_pair.transport_id =
       "RTCTransport_transport_" +
       rtc::ToString<>(cricket::ICE_CANDIDATE_COMPONENT_RTP);
   expected_pair.local_candidate_id = "RTCIceCandidate_" + local_candidate->id();
   expected_pair.remote_candidate_id =
       "RTCIceCandidate_" + remote_candidate->id();
   expected_pair.writable = true;
   expected_pair.bytes_sent = 42;
   expected_pair.bytes_received = 1234;
-  expected_pair.current_rtt = 1.337;
+  expected_pair.current_round_trip_time = 1.337;
   expected_pair.requests_received = 2020;
   expected_pair.requests_sent = 2000;
   expected_pair.responses_received = 4321;
   expected_pair.responses_sent = 1000;
   expected_pair.consent_requests_sent = (2020 - 2000);
 
   EXPECT_TRUE(report->Get(expected_pair.id()));
   EXPECT_EQ(
       expected_pair,
       report->Get(expected_pair.id())->cast_to<RTCIceCandidatePairStats>());
@@ skipping 838 matching lines @@
   rtc::scoped_refptr<FakeRTCStatsCollector> collector_;
 };
 
 TEST_F(RTCStatsCollectorTestWithFakeCollector, ThreadUsageAndResultsMerging) {
   collector_->VerifyThreadUsageAndResultsMerging();
 }
 
 }  // namespace
 
 }  // namespace webrtc