tree ff95469765674ae89e4fe5f3d2080f0d7fc0a9d9
parent f19c39201b740bd2eeb761ce77b8e75ea302ce8d
author dierksen <dierksen@google.com> 1530208705 -0400
committer Jonathan Dierksen <dierksen@google.com> 1530210956 -0400

Revert back to minimum_os_version = 10.12.

Travis uses 10.12 for its Xcode 9.2 image. Once we move to Xcode 9.4
we should be able to roll forward again.

PiperOrigin-RevId: 202507554