[Sync] Don't start up sync when FirstSetupCompleted is false and no setup in progress

[Sync] Don't start up sync when FirstSetupCompleted is false and no setup in progress

Instead of starting up the backend, we now don't even start it up if the first
setup completed flag is false, unless a setup is in progress. On auto start
platforms, first setup completed is manually set to true as part of init.

BUG=624915
Review-Url: https://codereview.chromium.org/2159453002
Cr-Commit-Position: refs/heads/master@{#405950}
(cherry picked from commit d1de1f77e44072018f41b1f54ffca27a7069edb4)

Committed: https://chromium.googlesource.com/chromium/src/+/fc73af1efc8567989b54e27b53977bd92937d0de

[Nicolas Zea, 2016-07-22 19:27:52]

Description was changed from

==========
[Sync] Don't start up sync when FirstSetupCompleted is false and no setup in
progress

Instead of starting up the backend, we now don't even start it up if the first
setup completed flag is false, unless a setup is in progress. On auto start
platforms, first setup completed is manually set to true as part of init.

BUG=624915

Review-Url: https://codereview.chromium.org/2159453002
Cr-Commit-Position: refs/heads/master@{#405950}
(cherry picked from commit d1de1f77e44072018f41b1f54ffca27a7069edb4)
==========

to

==========
[Sync] Don't start up sync when FirstSetupCompleted is false and no setup in
progress

Instead of starting up the backend, we now don't even start it up if the first
setup completed flag is false, unless a setup is in progress. On auto start
platforms, first setup completed is manually set to true as part of init.

BUG=624915

Review-Url: https://codereview.chromium.org/2159453002
Cr-Commit-Position: refs/heads/master@{#405950}
(cherry picked from commit d1de1f77e44072018f41b1f54ffca27a7069edb4)

Committed:
https://chromium.googlesource.com/chromium/src/+/fc73af1efc8567989b54e27b5397...
==========

[Nicolas Zea, 2016-07-22 19:27:54]

Committed patchset #1 (id:1) manually as
fc73af1efc8567989b54e27b53977bd92937d0de.