Revert "Break strong ref to ExpandableNotificationRow"

Revert "Pass main executor to ActivityLaunchAnimator"

Revert submission 11213348-launch-animation-leak

Reason for revert: Regression b/156840927
Reverted Changes:
Id43847e3d:Break strong ref to ExpandableNotificationRow
I57ffe83b7:Pass main executor to ActivityLaunchAnimator
I5bddc38ac:Pass main executor to ActivityLaunchAnimator
Fixes: b/156840927

Change-Id: Icda11a53c0bbf826037af0736c65c0e57e8ce2e6