Update about:flags text for the password manager re-auth option.

BUG=None
R=sergiu@chromium.org

Review URL: https://codereview.chromium.org/104863002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238705 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238705