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
1 file changed