Merge "Simplify looper selection when instantiating MediaSession"

                mCallback = null;

                return;

            }

            if (handler == null) {

                handler = new Handler();

            }

            Looper looper = handler != null ? handler.getLooper() : Looper.myLooper();

            callback.mSession = this;

            CallbackMessageHandler msgHandler = new CallbackMessageHandler(handler.getLooper(),

                    callback);

            CallbackMessageHandler msgHandler = new CallbackMessageHandler(looper, callback);

            mCallback = msgHandler;

        }

    }