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The profile name and avatar icon will not be syncable prefs anymore. We
have decided that the user will need to customize their profile once per
device if they wish to. We also change the strategy for showing the
avatar icon of the profile to the following:
* For profiles that are not signed in, on events like sign in or enable
sync, Gaia avatar wins.
* If the user customizes their profile while having a butter account or
a primary account on this device, the customized avatar wins.
* If the profile has a butter account A with customized avatar, if the
user decides to start syncing with account A, the customized avatar
wins. We do not want to change the state of the profile given that it is
the same account.
* If the profile has a butter account A with customized avatar, if the
user decides to start syncing with account B, the Gaia avatar wins.

Bug: 1013597
Change-Id: Ic60cca56d31e20a31d010e9f8995a03ca7819623
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1855968
Commit-Queue: Monica Basta <msalama@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706062}