Remove unused methods of SurfaceAnimator

The methods haven't been used in many years.

History: Ib31c1e765639e5490208bccba77b25318ec8dc71

Bug: 163976519
Flag: EXEMPT remove dead code
Test: CtsWindowManagerDeviceActivity
Change-Id: I4451e738854b6f9565cea9ed5d94cb6114915c97
3 files changed