Replace Guava's Optional with Java 8 Optional

Change-Id: I3427c90a64a5374fc4b083fad2d640e8ce0c6d15
8 files changed
tree: 09a00154e3229fffa3f0e02107f815f42e5ea5cd
  1. src/
  2. tools/
  3. .gitignore
  4. bazlets.bzl
  5. BUILD
  6. external_plugin_deps.bzl
  7. WORKSPACE