Prep-CL for adding new RTCStatsMeember types in WebRTC repo.

If-statement prevents a crash in a unittest that would occur if rolling
after the WebRTC change.

The WebRTC change: https://codereview.webrtc.org/2387343002/

BUG=chromium:627816

Review-Url: https://codereview.chromium.org/2390743003
Cr-Commit-Position: refs/heads/master@{#422758}

content/renderer/media/rtc_peer_connection_handler_unittest.cc

@@ -720,6 +720,12 @@ TEST_F(RTCPeerConnectionHandlerTest, GetRTCStats) {
       for (size_t i = 0; i < stats->membersCount(); ++i) {
         std::unique_ptr<blink::WebRTCStatsMember> member =
             stats->getMember(i);
+        // TODO(hbos): A WebRTC-change is adding new members, this would cause
+        // not all members to be defined. This if-statement saves Chromium from
+        // crashing. As soon as the change has been rolled in, I will update
+        // this test. crbug.com/627816
+        if (!member->isDefined())
+          continue;
         EXPECT_TRUE(member->isDefined());
         members.insert(member->type());
         switch (member->type()) {