The build was failing with:
In file included from ../../third_party/blink/renderer/modules/webcodecs/audio_encoder.cc:7:
In file included from ../../media/audio/audio_opus_encoder.h:16:
gen/shim_headers/opus_shim/third_party/opus/src/include/opus.h:5:10: error: 'opus.h' file not found with <angled> include; use "quotes" instead
#include <opus.h>
^~~~~~~~
"opus.h"
[...]
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
[42272/44233] CXX obj/third_party/blink/renderer/modules/webcodecs/webcodecs/decoder_template.oo[K
Note: This also fixes the ungoogled-chromium channel name in versionRange.