message: Fix naming issue in BUILD.bazel for signatures.
diff: @@ -11,12 +11,9 @@ py_library(
  srcs_version = "PY3",
  deps = [
  ":_public_key_sign",
  - ":_public_key_sign_key_manager",
  - ":_public_key_sign_wrapper",
  ":_public_key_verify",
  - ":_public_key_verify_key_manager",
  - ":_public_key_verify_wrapper",
  ":_signature_key_templates",
  + ":_signature_key_manager",
  ],
  )
  