chore: cherry-pick b5950ad76471 from chromium #22945
Protect automatic pull handlers with Mutex
In some cases, |rendering_automatic_pull_handlers_| in
crash on the repro case after 30 min.
Test: Locally confirmed that the ASAN build with this patch does not
Notes: Security: backport fix for CVE-2020-6451: Use after free in WebAudio
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