Remove art_chroot build target.

ArtGtestsTargetChroot depends on the ART apex directly now,
and the rest of apexes is unused. We switched to using the
device apexes for other modules (i.e. not updating them).

Bug: 196361021
Bug: 187416712
Test: atest ArtGtestsTargetChroot
Change-Id: I6705224ec4821997dc1546fcf734ca19a1e265dd
2 files changed