Migration in preparation for deletion of ByteStringUtils.
Bug: 124232146
Test: build only (tested in upstream)
Exempt-From-Owner-Approval: Already approved in upstream.
Merged-In: I6ee12e9914503a5b628ae6da82a396aa71dd972c
Change-Id: I6ee12e9914503a5b628ae6da82a396aa71dd972c
(cherry picked from commit e1d80fa415)