tree d45b5be2b04d464cce44d9684a607f21eb8949f3
parent ef058068d08efa9344a27b4e0454df9bc0025a56
author erfanian <erfanian@google.com> 1530291763 -0700
committer Copybara-Service <copybara-piper@google.com> 1530296922 -0700

Remove more instances of guava optional for built in optional.

Test: tap
PiperOrigin-RevId: 202663404
Change-Id: Ic229d77f8f14bb9e60e82889ed5788dee600e957