Fix orientation of preview surface when device rotated.

- Cleaned up some unused methods in InCallActivity.
- In onDeviceOrientationChanged, handle orientatoin change by resizing
surface.
- Fixed setPreviewSize which was not rotating the surface the appropriate
way (ensured it was setting a transform on the surface, and also made sure
that the correct dimensions were being passed in).

Bug: 19850018
Change-Id: Ia9324ce6bad5a797839e69ba20244f2bcc44acb5