Bug 893910 - Reset FHR submission failure count after timeout. r=rnewman

--HG--
extra : rebase_source : d63fe817b34f09bdb3322eef353e4c7fe7a3e1ac
Bug 898811 - Use the system error reporter for XBL compilation. r=mrbkap

The current XBL error reporter logs things to the console service, but not to
stderr. And in certain situations (especially if there's a parse error in
frontend XBL that leaves the browser in a half-baked state), it can be very
difficult to get to the error console.

So we should log to stderr too, which is exactly what the system error reporter
does.