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On startup,check if two or more profiles has the same default profile
name, e.g: "Person 1", for these profiles recompute the local profile
name in a way that "Person n" is unique.

This can happen because the profile name was a syncable pref so having
two profiles with the same local profile name "Person n" was possible.

Bug: 1012182
Change-Id: Ic19352c4fdd15717b7d88c53e3e769eb3dfaa8bd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1864781
Commit-Queue: Monica Basta <msalama@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706838}