bug 1019170: no new hamachi/helix/nexus-4 updates since may 30th - revert update channel logic for old style updates. r=nthomas

--HG--
branch : production
extra : transplant_source : Vn%F7%9E%D9%5B%10%EF%CA%15%92Y%E0%B5R%FA%B7l%A3K