Markus Handell 4ab7ddeb9f Migrate stray leftovers from rtc_base/ and test/ to webrtc::Mutex.
Migrates cases found from manual inspection of the code.

Bug: webrtc:11567
Change-Id: Ie8866435f3d3ca325e0811bf7cfb7e388ec987d4
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/179067
Reviewed-by: Tommi <tommi@webrtc.org>
Commit-Queue: Markus Handell <handellm@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31717}
2020-07-13 13:14:34 +00:00
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