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When the user clicks on "Cancel" on the sync confirmation dialog, only
the sync consent is revoked (the primary acount is *not* cleared), so
it naming the corresponding enum entry ABORT_SYNC instead of ABORT_SIGNIN
is more accurate.

Bug: 1155505
Change-Id: Ibc032c1c7f7e9b5493cdb1f8b4f996152f9d7f8b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2578842
Commit-Queue: Mihai Sardarescu <msarda@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835205}