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SplitSettingsSync will allow the user to opt-out of browser sync.
However, IdentityManager::GetPrimaryAccount() assumes the user has
consented to sync. Switch to using the "unconsented" primary account,
which exists whether or not the user has consented to sync.

This code doesn't add a DCHECK that the unconsented primary account
exists because there are managed guest session tests that don't
have a primary account but still exercise this code path.

      and on device

Test: existing login browser tests, manual tests of login on linux
Bug: 1042400
Change-Id: I14ee7bcc18c294dee31c26fcc9bed537836516b4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2015589
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734647}