RTCIceCandidatePairStats.consentRequestsSent set by RTCStatsCollector
and requestsSent is updated.

Before:
  requestsSent = total ping requests
Now
  requestsSent = pings sent before first response
  consentRequestsSent = pings after first response

Spec: https://w3c.github.io/webrtc-stats/#dom-rtcicecandidatepairstats-consentrequestssent

BUG=chromium:633550

Review-Url: https://codereview.webrtc.org/2558293002
Cr-Commit-Position: refs/heads/master@{#15541}
diff --git a/webrtc/api/rtcstats_integrationtest.cc b/webrtc/api/rtcstats_integrationtest.cc
index 4c57304..923997c 100644
--- a/webrtc/api/rtcstats_integrationtest.cc
+++ b/webrtc/api/rtcstats_integrationtest.cc
@@ -345,7 +345,7 @@
     verifier.TestMemberIsUndefined(candidate_pair.retransmissions_received);
     verifier.TestMemberIsUndefined(candidate_pair.retransmissions_sent);
     verifier.TestMemberIsUndefined(candidate_pair.consent_requests_received);
-    verifier.TestMemberIsUndefined(candidate_pair.consent_requests_sent);
+    verifier.TestMemberIsDefined(candidate_pair.consent_requests_sent);
     verifier.TestMemberIsUndefined(candidate_pair.consent_responses_received);
     verifier.TestMemberIsUndefined(candidate_pair.consent_responses_sent);
     return verifier.ExpectAllMembersSuccessfullyTested();