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The hosted domain is already stored in the AccountInfo (managed by
the AccountTrackerService). This CL removes the preference
|kGoogleServicesHostedDomain| as it holds duplicated information.

Note: There is a slight change of behavior as
GaiaInfoUpdateService::UpdatePrimaryAccount may no longer be called
on start-up if the hosted domain is missing. This may lead to the
profile info cache not being updated if the application crashed after
the AccountInfo was stored on disk, but before the ProfileInfoCache was
stored on disk (in production code, this is impossible as the
GaiaInfoUpdateService updates the primary account information as soon
as AccountInfo is updated by the AccountTracker).

Bug: None

Change-Id: I6c7697d55528198a86f2a8a1612407c4f8807817
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2617704Reviewed-by: Monica Basta <msalama@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: David Roger <droger@chromium.org>
Auto-Submit: Mihai Sardarescu <msarda@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842250}