Bug 1100530 - Clean up OS X version constants. f=jgilbert, r=mstange
Bug 1107545 - introduce a test manager to make storage tests scalable. r=cpearce.
Bug 1107545 - add off-main-thread tests for GMPStorage APIs. r=cpearce.
Bug 1106324 - Call removeLock in case where the call was missing. r=qdot

While I was debugging bug 1105511, khuey noticed that one case was
missing a removeLock call.  We should add it; it seems like if we ever
hit this error case, the settings lock queue would get stuck.  It's not
clear whether this is actually the cause of bug 1105511, so I'm putting
it in a separate bug.