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This is ground work for moving ProfileSyncService to the ThreadPool (see bug) but also a logical
change by itself since these functions have no specific need to be run on a dedicated thread.

Change-Id: I45bdbeb0a768af838700a37945613c1ddc475ea0

Bug: 1014464
Change-Id: I45bdbeb0a768af838700a37945613c1ddc475ea0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1862666Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Oliver Li <olivierli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706523}