apps may (ab)use AnimationDrawable.run and Animation.setAnimationListener
to time transitions between states; even though we don't currently implement
the animations, state transitions are still desirable (otherwise the app may
lock up)
These were originally needed because the official android.support classes
required APIs that we didn't support and it didn't seem worth the effort
to make them happy when the actual apps using these compat classes
were comparatively trivial.
We now support all the necessary APIs, so we can remove the overrides
and let the apps use their bundled android.support classes.
