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This reverts commit 42484004.

Reason for revert: Investigation has concluded, see crbug.com/1120899

Original change's description:
> Sync: don't start up again (in transport mode) after StopAndClear
>
> This is essentially a revert of crrev.com/c/1082267 (undoing the actual
> 1-line change from that CL, but keeping the comment improvements).
> This is a temporary measure to investigate crbug.com/1120899.
>
> Bug: 1120899, 1082267
> Change-Id: I7761418c038824218a7fc36b325f1b364f7bbbe5
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2401460
> Commit-Queue: Marc Treib <treib@chromium.org>
> Reviewed-by: Mikel Astiz <mastiz@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#805489}

TBR=treib@chromium.org,mastiz@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1120899
Bug: 1082267
Change-Id: I75e64d1988cc585e2aa344058ac4d50dbb73fd34
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2438386Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812035}