Revert "Move BinderObserver-related handling to BinderObserver"

Revert submission 34435100

Reason for revert: Droidmonitor created revert due to b/432893815. Will be verifying through ABTD before submission.

Bug: 432893815

Reverted changes: /q/submissionid:34435100

Change-Id: I54ce7eb5bc0aac8e1a6ef60de0cc3bcd127d3aa4