Remove GestureDetector_SimpleOnGestureListenerTest

GestureDetector_SimpleOnGestureListenerTest fails only when
run in batch mode after the GestureDetectorTest. This test
just does "GestureDetectorTestUtil.testGestureDetector(this,
mActivity);" with GestureDetectorStubActivity. However,
GestureDetectorTest already does this same test with the
same activity. Something about running it twice causes
a problem.

Change-Id: I1984beda26607eaa59a9df767e5f51cca90994ad