gclient should be the one syncing the solutions to the appropriate
revisions.

Bug: 850812, 853032
Change-Id: Ieefc5661627d4864deb0d4e7053168a99da29d29
Reviewed-on: https://chromium-review.googlesource.com/1102833Reviewed-by: Aaron Gable <agable@chromium.org>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>