Remove support for requesting handover via connection events.

                                          PhoneAccountHandle handoverToHandle,

                                          int videoState, Bundle initiatingExtras) {

        boolean isHandoverFromSupported = isHandoverFromPhoneAccountSupported(

                handoverFromCall.getTargetPhoneAccount());

        boolean isHandoverToSupported = isHandoverToPhoneAccountSupported(handoverToHandle);

        if (!isHandoverFromSupported || !isHandoverToSupported || hasEmergencyCall()) {

            handoverFromCall.sendCallEvent(android.telecom.Call.EVENT_HANDOVER_FAILED, null);

            return;

        }

        Log.addEvent(handoverFromCall, LogUtils.Events.HANDOVER_REQUEST, handoverToHandle);

        Bundle extras = new Bundle();

        extras.putBoolean(TelecomManager.EXTRA_IS_HANDOVER, true);

        extras.putParcelable(TelecomManager.EXTRA_HANDOVER_FROM_PHONE_ACCOUNT,

                handoverFromCall.getTargetPhoneAccount());

        extras.putInt(TelecomManager.EXTRA_START_CALL_WITH_VIDEO_STATE, videoState);

        if (initiatingExtras != null) {

            extras.putAll(initiatingExtras);

        }

        extras.putParcelable(TelecomManager.EXTRA_CALL_AUDIO_STATE,

                mCallAudioManager.getCallAudioState());

        Call handoverToCall = createHandoverCall(handoverFromCall.getHandle(), handoverToHandle,

                extras, getCurrentUserHandle());

        if (handoverToCall == null) {

        handoverFromCall.sendCallEvent(android.telecom.Call.EVENT_HANDOVER_FAILED, null);

            return;

        }

        Log.addEvent(handoverFromCall, LogUtils.Events.START_HANDOVER,

                "handOverFrom=%s, handOverTo=%s", handoverFromCall.getId(), handoverToCall.getId());

        handoverFromCall.setHandoverDestinationCall(handoverToCall);

        handoverFromCall.setHandoverState(HandoverState.HANDOVER_FROM_STARTED);

        handoverToCall.setHandoverState(HandoverState.HANDOVER_TO_STARTED);

        handoverToCall.setHandoverSourceCall(handoverFromCall);

        handoverToCall.setNewOutgoingCallIntentBroadcastIsDone();

        placeOutgoingCall(handoverToCall, handoverToCall.getHandle(), null /* gatewayInfo */,

                false /* startwithSpeaker */,

                videoState);

        Log.addEvent(handoverFromCall, LogUtils.Events.HANDOVER_REQUEST, "legacy request denied");

    }

    public Call createHandoverCall(Uri handle, PhoneAccountHandle handoverToHandle,