e15f53d923
dart_style becomes a dev_dependency, and remove the ability to auto-run it from dart backend, instead use the test formatter migrate to package:test, which has a few tricky bits: * expect can only appear inside a test now (https://github.com/dart-lang/test/issues/132) * mirrors is needed to get the test folder (https://github.com/dart-lang/test/issues/110) * test `main` can't take arguments. not sure what's up there, but not a big deal for us either. R=vsm@google.com Review URL: https://codereview.chromium.org/1166683005