message: Remove runtime/references check from cpplint config.
  Cr-Commit-Position: refs/heads/master@{#31393}
diff: @@ -47,10 +47,13 @@ CPPLINT_BLACKLIST = [
  # - build/c++11 : Rvalue ref checks are unreliable (false positives),
  # include file and feature blacklists are
  # google3-specific.
  +# - runtime/references : Mutable references are not banned by the Google
  +# C++ style guide anymore (starting from May 2020).
  # - whitespace/operators: Same as above (doesn't seem sufficient to eliminate
  # all move-related errors).
  BLACKLIST_LINT_FILTERS = [
  '-build/c++11',
  + '-runtime/references',
  '-whitespace/operators',
  ]
  