Bug 1891082 - Remove outdated comments in DecoderAgent r=media-playback-reviewers,padenot

Depends on D220506

Differential Revision: https://phabricator.services.mozilla.com/D221224

UltraBlame original commit: ec6625c1ead27137cb8887c5e68fa717d833606d

Author: marco-c

dom/media/webcodecs/DecoderAgent.cpp

@@ -709,44 +709,6 @@ GetSingleton
 (
 )
 ;
-/
-/
-Bug
-1839993
-:
-FFmpegDataDecoder
-ignores
-all
-decode
-errors
-when
-draining
-so
-/
-/
-WPT
-cannot
-receive
-error
-callbacks
-.
-Forcibly
-enable
-LowLatency
-for
-now
-to
-/
-/
-get
-the
-decoded
-results
-immediately
-to
-avoid
-this
-.
 auto
 params
 =