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Methods OnPrimaryAccountSet/Cleared are deprecated. This CL changes
these calls to OnPrimaryAccountChanged().

As on iOS, the user cannot be signed with a primary account at
ConsentLevel::kNotRequired (on iOS, setting a primary account requires
the user to go through the sync consent), the migration is defensive
and DCHECKs that the OnPrimaryAccountChanged() are always fired for
primary account changes at sync level.

Bug: 1158855

Change-Id: I071545f01f2a984a365d563997997873d75fd86d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2617881
Auto-Submit: Mihai Sardarescu <msarda@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Tanmoy Mollik <triploblastic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842020}