Remove framemarking RTP extension.

BUG=webrtc:11637

Change-Id: I47f8e22473429c9762956444e27cfbafb201b208
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/176442
Commit-Queue: Philip Eliasson <philipel@webrtc.org>
Reviewed-by: Tommi <tommi@webrtc.org>
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31522}
diff --git a/modules/video_coding/packet_buffer.cc b/modules/video_coding/packet_buffer.cc
index ad82211..7da8a1c 100644
--- a/modules/video_coding/packet_buffer.cc
+++ b/modules/video_coding/packet_buffer.cc
@@ -363,15 +363,10 @@
               VideoFrameType::kVideoFrameDelta;
         }
 
-        // With IPPP, if this is not a keyframe, make sure there are no gaps
-        // in the packet sequence numbers up until this point.
-        const uint8_t h264tid =
-            buffer_[start_index] != nullptr
-                ? buffer_[start_index]->video_header.frame_marking.temporal_id
-                : kNoTemporalIdx;
-        if (h264tid == kNoTemporalIdx && !is_h264_keyframe &&
-            missing_packets_.upper_bound(start_seq_num) !=
-                missing_packets_.begin()) {
+        // If this is not a keyframe, make sure there are no gaps in the packet
+        // sequence numbers up until this point.
+        if (!is_h264_keyframe && missing_packets_.upper_bound(start_seq_num) !=
+                                     missing_packets_.begin()) {
           return found_frames;
         }
       }