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Per-project coding style: ref counted types must be thread-safe and
sequence affinity declared with sequence checkers in destructors
if needed.

The motivation for such change is that our types get aggregated in
different ways, and mixing thread-safe and non thread-safe may
result into puzzling asserts in ref-counting code when objects
get shared between sequences.

Bug: 1105922
Change-Id: Ie3b182b31765d0416ae5d6ca108782843b95528e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2314677Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Commit-Queue: Sorin Jianu <sorin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791248}