Fixed the value of "controlledBy" for preferences when they're set by the user.

BUG=107098, 106592
TEST=unit_tests:PrefValueStoreTest.*


Review URL: http://codereview.chromium.org/8896023

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@114009 0039d316-1c4b-4281-b951-d872f2087c98
6 files changed