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The primary account can be butter or sync account depending on the
consent level. This CL adds consent level as a parameter to
GetPrimaryAccount* and HasPrimaryAccount to indicate the consent level
required by the caller. It can be |kNotRequired|, in that case it
returns the corresponding info of the primary account if it exists. If
consent is |kSync|, it returns the corresponding info if the primary
account exists and was granted sync consent.

Bug: 1046746
Change-Id: Id69f1f234228166f347e01f044672836fd88d5be
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2033351
Commit-Queue: Monica Basta <msalama@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737791}