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This change is the last mile of of the Chrome-wide effort to prefer Sequences to
Physical Threads (https://chromium.googlesource.com/chromium/src/+/master/docs/threading_and_tasks.md#Prefer-Sequences-to-Physical-Threads)

This change is intended to be a no-op from sync's point of view.

Change-Id: Ie771c3a681b0483711ec1232544b92f2766caf47

Bug: 1014464
Change-Id: Ie771c3a681b0483711ec1232544b92f2766caf47
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1856922
Commit-Queue: Oliver Li <olivierli@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709898}