Revert "Break strong ref to ExpandableNotificationRow"

This reverts commit a9593e965db697da3018f600bbe70581fbdf34fc.

Reason for revert: Causing NPE, see b/144701184.

Bug: 144109427
Fixes: 144701184
Change-Id: Icb6f95f73219944b905822cbfa1f0c6460b3d628
1 file changed