Bug 880168: Replace RemoveDeviceTask by non-blocking implementation, r=echou,gyeh

This patch replaces RemoveDeviceTask by a non-blocking implementation
that does not use the Bluetooth command thread. The request gets send
directly to the DBus, and its reply gets processed in the DBus thread
itself.

--HG--
rename : netwerk/protocol/http/HttpLog.h => netwerk/protocol/http/nsHttp.h
extra : rebase_source : a99a9d6561d94df77d8d9cd53e39371aa1f6386d