Fixing RTCIceCandidatePairStats.nominated for ICE controlling agent.

Was only working when the nonstandard "renomination" extension to ICE
is enabled, which chromium doesn't use.

BUG=chromium:734094

Review-Url: https://codereview.webrtc.org/2957303002
Cr-Commit-Position: refs/heads/master@{#18814}
diff --git a/webrtc/pc/rtcstats_integrationtest.cc b/webrtc/pc/rtcstats_integrationtest.cc
index 03fb96c..3337c4e 100644
--- a/webrtc/pc/rtcstats_integrationtest.cc
+++ b/webrtc/pc/rtcstats_integrationtest.cc
@@ -379,6 +379,8 @@
     if (is_selected_pair) {
       verifier.TestMemberIsNonNegative<double>(
           candidate_pair.available_outgoing_bitrate);
+      // A pair should be nominated in order to be selected.
+      EXPECT_TRUE(*candidate_pair.nominated);
     } else {
       verifier.TestMemberIsUndefined(candidate_pair.available_outgoing_bitrate);
     }