Revert of Add a flags field to video timing extension.

webrtc/modules/video_coding/generic_decoder.cc

Index: webrtc/modules/video_coding/generic_decoder.cc
diff --git a/webrtc/modules/video_coding/generic_decoder.cc b/webrtc/modules/video_coding/generic_decoder.cc
index 3b2a620e1209970083942febe42eb2024547af99..cc14794e090ce94121bbec4af8ef7458ae61f03a 100644
--- a/webrtc/modules/video_coding/generic_decoder.cc
+++ b/webrtc/modules/video_coding/generic_decoder.cc
@@ -92,7 +92,7 @@
                            frameInfo->renderTimeMs);
 
   // Report timing information.
-  if (frameInfo->timing.flags != TimingFrameFlags::kInvalid) {
+  if (frameInfo->timing.is_timing_frame) {
     int64_t capture_time_ms = decodedImage.ntp_time_ms() - ntp_offset_;
     // Convert remote timestamps to local time from ntp timestamps.
     frameInfo->timing.encode_start_ms -= ntp_offset_;
@@ -137,7 +137,6 @@
     timing_frame_info.decode_finish_ms = now_ms;
     timing_frame_info.render_time_ms = frameInfo->renderTimeMs;
     timing_frame_info.rtp_timestamp = decodedImage.timestamp();
-    timing_frame_info.flags = frameInfo->timing.flags;
 
     _timing->SetTimingFrameInfo(timing_frame_info);
   }