Update to error_prone 2.0.19
am: 0fc37229d7

Change-Id: I3558898f60a269de0955d10f77dc83efa8b93430
tree: 7222688f0efe074990c4b21715d8ff0c541b06cc
  1. checkerframework/
  2. error_prone/
  3. javac/
  4. jFormatString/