Revert "Improve first opaque activity candidate detection"

This reverts commit bcf680d0.

Reason for revert: CTS failure (b/282108996). Generate a revert ag/ for cherrypick. Don't merge this to tm-qpr-dev.
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:7317484adb238126b642925942fffc0e66366c72)
Merged-In: Iaf798cbf95d750c199470a7dbdfa53c490119ea3
Change-Id: Iaf798cbf95d750c199470a7dbdfa53c490119ea3