Remove custom Robolectric util class.

We directly use Robolectric/ActivityController to
setup an FragmentActivity lifecycle.

So, I removed the custom Robolectric in robotests/testutils.

Change-Id: Ib93265f719e1eb9606c9ad6f05c1dd1957302e8b
Fixes: 111195450
Test: robotests
7 files changed