Follow-up to 'Revert "Reduce visibility of *CredentialsFact...'

Mark these public factories with `UsedAt` so there it is no longer
tempting to package-protect them.

Change-Id: Icd4bec980472851dfb769159c1abb528e353cbd9
2 files changed
tree: ca531c7bd62fd3ae07c16789b6d1f98140dec70e
  1. .settings/
  2. src/
  3. .gitignore
  4. .mailmap
  5. BUILD
  6. LICENSE