stats: add address as alias for ip

this was renamed in https://github.com/w3c/webrtc-pc/issues/1913 and https://github.com/w3c/webrtc-stats/pull/381

Spec: https://w3c.github.io/webrtc-stats/#dom-rtcicecandidatestats-address

BUG=chromium:968203

Change-Id: If75849fe1dc87ada6850e7b64aa8569e13baf0d8
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/212681
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Reviewed-by: Henrik Boström <hbos@webrtc.org>
Commit-Queue: Philipp Hancke <philipp.hancke@googlemail.com>
Cr-Commit-Position: refs/heads/master@{#33534}
diff --git a/api/stats/rtcstats_objects.h b/api/stats/rtcstats_objects.h
index a4e8ead..3b92419 100644
--- a/api/stats/rtcstats_objects.h
+++ b/api/stats/rtcstats_objects.h
@@ -211,6 +211,7 @@
   RTCStatsMember<bool> is_remote;
   RTCStatsMember<std::string> network_type;
   RTCStatsMember<std::string> ip;
+  RTCStatsMember<std::string> address;
   RTCStatsMember<int32_t> port;
   RTCStatsMember<std::string> protocol;
   RTCStatsMember<std::string> relay_protocol;