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SplitSettingsSync will allow the user to opt-out of browser sync.
However, IdentityAccessor::GetPrimaryAccountInfo() assumes the user has
consented to browser sync. ARC has its own consent, unrelated to
chrome browser sync consent. Switch to using the "unconsented"
primary account. This account is always the main GAIA account for the
signed-in user, and exists whether or not the user has consented
to browser sync.

This requires updating:
* ArcAuthService
* ArcSupportHost
* ArcAndroidManagementChecker

See go/cros-primary-account and go/cros-sync-mock for details.

TBR=droger@chromium.org

Bug: 1042400
Test: updated existing unit tests and browser tests
Test: Set --use-unconsented-primary-account and
  --enable-features=SplitSettingsSync and verify Play Store runs
  and is signed in after:
  * Login with consumer @gmail.com
  * Enroll to @google.com and signin with @google.com
  * Enroll to @managedchrome.com and signin with managed guest

Change-Id: I48abe048a95d6aa234d4b87e76b2d70c5e88aebd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2029307
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Yury Khmel <khmel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737384}