Fix UiBench MainActivity fragment

fixes: 30015965

Changes ListFragment to no longer be anonymous (so it can be properly
recreated from instance state).

Change-Id: I521fb9bf7306a07d5179ad945d64e8977640cc5b
(cherry picked from commit 0ede07d4bd59b4a2108fda1cd4ab767cc0058fb8)
1 file changed