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The kGoogleServicesUsername pref indicates that Chrome is signed in with a
GAIA account. Since device-local accounts do not have GAIA credentials,
this pref should not be set for them.

BUG=327849
TEST=Extended browser tests

Review URL: https://codereview.chromium.org/251703004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@266529 0039d316-1c4b-4281-b951-d872f2087c98