Make location use _map instead of _operator.
Make location use _map instead of _operator.

Summary: _operator is overkill for this operator.

Reviewers: #material_motion, O4 Material Apple platform reviewers, O2 Material Motion, markwei

Reviewed By: #material_motion, O4 Material Apple platform reviewers, O2 Material Motion, markwei

Tags: #material_motion

Differential Revision: http://codereview.cc/D2260

material-motion/material-motion-swift,material-motion/material-motion-swift