Bug 1103192 - Replace Utils.extend with Object.assign in sms
r=azasypkin, julien

Bug 1103192 - Replace Utils.extend with Object.assign in sms

Bug 1103192 - Replace Utils.extend with Object.assign in sms - Removed leftover parts of test
Merge branch 'Bug1103192' of https://github.com/charleyf/gaia into Bug1103192