message: Remove a CHECK that depends on implementation details of proto library
diff: @@ -372,7 +372,6 @@ void BoostedTreesEnsembleResource::Reset() {
  // Clear tree ensemle.
  arena_.Reset();
  - CHECK_EQ(0, arena_.SpaceAllocated());
  tree_ensemble_ =
  protobuf::Arena::CreateMessage<boosted_trees::TreeEnsemble>(&arena_);
  }
  