Replace Handler with Executor

This change addresses API council feedback around the new
setOnRtpRxNoticeListener method.

Bug: 168585020
Test: Manually built the tree.
Test: Tests pending as per b/169965769.
Change-Id: Ie8291df9b10960f78bdfdd5986767e896a953abf
Merged-In: Ie8291df9b10960f78bdfdd5986767e896a953abf
2 files changed