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Before this CL, StartupController had an explicit setup_in_progress_
flag, which was set and cleared by ProfileSyncService. This was
unnecessary, since
a) ProfileSyncService itself knows that state anyway (hence no need to
   forward IsSetupInProgress queries to the StartupController), and
b) StartupController only needs it within TryStart, where we can just
   pass it in.

Bug: 854978
Change-Id: Ia5eed20a993de78d1efaacb6709ca680035856fd
Reviewed-on: https://chromium-review.googlesource.com/1110226
Commit-Queue: Marc Treib <treib@chromium.org>
Reviewed-by: Jan Krcal <jkrcal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569567}