Bug 1058997 - Part 3b: Update non-trivial security prompts. r=past
Bug 1058997 - Part 3c: Remove always allow init calls from tests. r=past
Bug 1058997 - Part 3d: Restore always allow in listener tests. r=past
Bug 1058997 - Part 4: Only one DebuggerServer per loader. r=past

It was never necessary to pass a server reference to the socket listener, since
a given DevTools loader only ever contains a single server instance.