Remove unused bits for object ids. This will make the proto compress better. (cherry picked from commit c560e1bd74250cf134eeae3228fd61809161b4e9) Bug: 157638573 Change-Id: I3d9c0eda7ce128c6f4f1398f7da52d7717b254ff Merged-In: I3d9c0eda7ce128c6f4f1398f7da52d7717b254ff