Merge "Refactor EmergencyCallHelper -> RadioOnCallHelper" into stage-aosp-master am: 0f2bb4ba34  -s ours am: 794cdd8df0  -s ours am: ed6ded7890  -s ours
am: 6114f5bbe8  -s ours

Change-Id: Ia7aac22f699504b6d766d382a8ed19c2fe405170