stats: make inbound-rtp frame assembly time standard

standardized in
  https://github.com/w3c/webrtc-stats/pull/694

BUG=webrtc:13986

Change-Id: Ia24e7fa64a48ad6c88882c90fd03bd1d89408ea4
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/278789
Reviewed-by: Henrik Boström <hbos@webrtc.org>
Commit-Queue: Philipp Hancke <phancke@microsoft.com>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#38390}
diff --git a/api/stats/rtcstats_objects.h b/api/stats/rtcstats_objects.h
index 43bb3fa..80536fb 100644
--- a/api/stats/rtcstats_objects.h
+++ b/api/stats/rtcstats_objects.h
@@ -478,9 +478,8 @@
   RTCStatsMember<uint32_t> frames_dropped;
   RTCStatsMember<double> total_decode_time;
   RTCStatsMember<double> total_processing_delay;
-  // TODO(https://crbug.com/webrtc/13986): standardize
-  RTCNonStandardStatsMember<double> total_assembly_time;
-  RTCNonStandardStatsMember<uint32_t> frames_assembled_from_multiple_packets;
+  RTCStatsMember<double> total_assembly_time;
+  RTCStatsMember<uint32_t> frames_assembled_from_multiple_packets;
   RTCStatsMember<double> total_inter_frame_delay;
   RTCStatsMember<double> total_squared_inter_frame_delay;
   RTCStatsMember<uint32_t> pause_count;