Codemod "const Ref&" to "const Ref"

Summary: Not much of a codemod since there's only 2 code sites to change...

Reviewed By: @edwinsmith

Differential Revision: D1702707

Signature: t1:1702707:1416937381:a4de3760f52219a82ca47a1f7cae4e0a85aab08b