Revert "Populate active apexes cache in a background thread"

This reverts commit 97fc6d9c29dd08f75f4f7d82d17d9f422ec44147.

Reason for revert: b/132236259

Change-Id: I5270140580ebad16a9dc1db6b2e5f9faa977f54a
Bug: 132236259
3 files changed