Fix a bug that was causing the AutoFill infobar to not show.  Initially the AutoFillEnabled preference is false, so we were bailing out before giving the chance to enable AutoFill.  This changes to guard to |personal_data_|, which is necessary for DeterminePossibleFieldTypes.

BUG=none
TEST=none
Review URL: http://codereview.chromium.org/667018

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@40567 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed