Chromium change:
https://chromium.googlesource.com/chromium/src/+/547e262451926da590a9a55ecd926a2b5d9d3ebb
commit 547e262451926da590a9a55ecd926a2b5d9d3ebb
Author: Benoit Lize <lizeb@chromium.org>
Date: Fri Jul 1 12:22:37 2022 +0000
[blink/wtf] Complete the WTF::Mutex -> base::Lock transition
WTF::Mutex is no more, remove it.
As part of the last conversions, rename mutex -> lock, and convert some
comments to locking annotations.
Bug: 1290281