Prevent multiple instances of trunksd from running. DBus::Connection::request_name() does not indicate whether it successfully acquires the requested DBus name or not (chromium:364585). This CL changes trunksd to use newly introduced DBus::Connection::acquire_name() (CL:195002) to ensure that trunksd can successfully acquire its DBus name. BUG=None TEST=Build and run unit tests. Change-Id: I295479d183bd59a835024201f5fd04d0f57e1b5d Reviewed-on: https://chromium-review.googlesource.com/201242 Tested-by: Ben Chan <[email protected]> Commit-Queue: Ben Chan <[email protected]> Reviewed-by: mukesh agrawal <[email protected]>