Another dependency fix.
Another dependency fix.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/2823028

marineam/update_engine,mjg59/update_engine,mjg59/update_engine,marineam/update_engine,marineam/update_engine,endocode/update_engine,endocode/update_engine,mjg59/update_engine,endocode/update_engine,marineam/update_engine