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This CL does the following:
(1) If the user has not customized their local profile name |IsUsingDefaultName()
== true| and their local profile name is not 'Person %n', we change the
local profile name to 'Person %n'.
(2) For newly created profiles, we set the local profile name to 'Person %n'
unless the user specifies something else.
(3) Fix some corner cases for the display profile name.

Bug: 1018719
Change-Id: Ic92bde725d5e33105e251214f01b646a2ff63088
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1878377
Commit-Queue: Monica Basta <msalama@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710277}