am 45d7a205: Merge "Once responded to a call, remove it from list of ringing calls" into lmp-dev

    private void onRespondedToIncomingCall(Call call) {

        // Only stop the ringer if this call is the top-most incoming call.

        if (getTopMostUnansweredCall() == call) {

            stopRinging();

            stopCallWaiting();

            removeFromUnansweredCall(call);

        }

        // We do not remove the call from mRingingCalls until the call state changes from

        // STATE_RINGING or the call is removed. see onCallStateChanged or onCallRemoved.

    }

    private Call getTopMostUnansweredCall() {