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Replace the only check with a check for SplitSettingsSync. Enough
features have been converted to work with the unconsented primary
account that I don't need a separate flag for it any more.

Bug: 1042400
Test: existing signin tests
Change-Id: Iaf3690027737fd0ac674dad20d7da6107bb6b1b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2035862
Commit-Queue: Xiyuan Xia <xiyuan@chromium.org>
Auto-Submit: James Cook <jamescook@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737870}