Missed an invocation of _CryptohomePath.

BUG=308757
TEST=manual
NOTRY=True

Review URL: https://codereview.chromium.org/198103002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256656 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 256656