Bug 1085199 - Part 1: Do not wrap the DOMRequest in a promise in mobileconnection tests; r=hsinyi

DOMRequest now has a .then() method compatible with Promise.
Bug 1085199 - Part 2: Do not wrap the DOMRequest in a promise in dom/system/gonk tests; r=hsinyi

DOMRequest now has a .then() method compatible with Promise.