Revert "Support immersive mode with task bar"

This reverts commit dc1bbc2d63f74c432b854c1c143a3d92624b2485.

Reason for revert: b/198050304
Fixes: 198050304

Change-Id: If5eec6f3749f0fe20fdf6b1b63fdc02e6ddcab57
1 file changed