* chore: cherry-pick fix for 1233564 from chromium

Protect HRTF database loader thread from access by different threads

This patch add a new mutex locker around the HRTF database loader
thread to ensure the safe exclusive access of the loader thread
and the HRTF database.

(cherry picked from commit 6811e850ee10847da16c4d5fdc0f845494586b65)

Bug: 1233564
Change-Id: Ie12b99ffe520d3747e34af387a37637a10aab38a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3068260
Auto-Submit: Hongchan Choi <hongchan@chromium.org>
Commit-Queue: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>

[modify] https://crrev.com/033f0bdcbe538c61f532e97b03cb9c092a94b413/third_party/blink/renderer/platform/audio/hrtf_database_loader.cc
[modify] https://crrev.com/033f0bdcbe538c61f532e97b03cb9c092a94b413/third_party/blink/renderer/platform/audio/hrtf_database_loader.h

* chore: update patches

Co-authored-by: PatchUp <73610968+patchup[bot]@users.noreply.github.com>

…233564-from-chromium-1630326403542