Fix typo in VideoSendTiming header extension structure

Bug: None
Change-Id: Ic6c5613bea1fad3ac7456a691eb8e87efb6eeb2c
Reviewed-on: https://webrtc-review.googlesource.com/16980
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Reviewed-by: Magnus Jedvert <magjed@webrtc.org>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20497}
diff --git a/modules/video_coding/frame_buffer.cc b/modules/video_coding/frame_buffer.cc
index 207c5be..51fb20a 100644
--- a/modules/video_coding/frame_buffer.cc
+++ b/modules/video_coding/frame_buffer.cc
@@ -177,10 +177,10 @@
           ntp_time_ms_ + packet.video_header.video_timing.pacer_exit_delta_ms;
       timing_.network_timestamp_ms =
           ntp_time_ms_ +
-          packet.video_header.video_timing.network_timstamp_delta_ms;
+          packet.video_header.video_timing.network_timestamp_delta_ms;
       timing_.network2_timestamp_ms =
           ntp_time_ms_ +
-          packet.video_header.video_timing.network2_timstamp_delta_ms;
+          packet.video_header.video_timing.network2_timestamp_delta_ms;
     }
     timing_.flags = packet.video_header.video_timing.flags;
   }