AutoFill: Use PrefService::FindPreference instead of PrefService::HasPrefPath. HasPrefPath will crash if the preference is not registered.
AutoFill: Use PrefService::FindPreference instead of PrefService::HasPrefPath.
HasPrefPath will crash if the preference is not registered.

BUG=42358
TEST=none

Review URL: http://codereview.chromium.org/2007002

git-svn-id: http://src.chromium.org/svn/trunk/src@46519 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: f921e05963206af84656a036ceb8e8a3c743e3a7
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser