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This reverts commit f98214f3.

Reason for revert: CP for unblocking chromium merge sheriff

Original change's description:
> [Chromecast] Fix thread safety issues in CastAudioJson.
>
> Bug: internal 135280530
> Change-Id: I611e61735b4537e5db330cb6c78fe05fcb193170
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1706786
> Commit-Queue: Jenny Wong <jyw@chromium.org>
> Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#684198}

TBR=jyw@chromium.org,kmackay@chromium.org,mont@chromium.org

Bug: internal 135280530
Bug: b/140290037
Change-Id: I000c7e6b3e38d7a23781ed6b5480615cdd1d9a49
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1761698Reviewed-by: Michael Spang <spang@chromium.org>
Commit-Queue: Michael Spang <spang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#692073}