Bug 906019: Remove GetPropertiesReplyHandler, r=echou,gyeh

...because there is no need for this base class.

--HG--
extra : rebase_source : 0e1c3b40012f6132ae25611c00789b7f206e72d8
Bug 906019: Implemented non-blocking GetDefaultAdapterPathInternal, r=echou,gyeh

GetDefaultAdapterPathInternal used two blocking DBus operations,
namely 'DefaultAdapter' and 'GetProperties'. The latter one depends
on the result of the former one.

The be non-blocking, GetDefaultAdapterPathInternal first make a
non-blocking 'DefaultAdapter' call. Once received, the reply handler
non-blockingly calls 'GetProperties' with the values received for
'DefaultAdapter', and put itself in place as this call's reply
handler. For this second reply, it finally schedules the Bluetooth
reply runnable.

--HG--
extra : rebase_source : aa0872a5db69c928ca25723952fe2928ef52d107