Bug 816306: Part 1 - Report more network errors during update checks. r=bbondy, a=bb+
Bug 816306: Part 2 - Report update HTTP errors to Gaia, and accompanying tests. r=fabrice, a=bb+
Bug 828969 - Dispatch the mozbrowserasyncscroll event asynchronously, thus preventing deadlocks (and probably other problems). r=bz, a=bb+
Backed out changeset 7351f854af2f (bug 829043)
Backed out changeset c34b62cab2a7 (bug 829043)