message: minor change per Google code review suggestion
diff: @@ -5144,8 +5144,8 @@ static void BM_MklLayoutRewritePass(int iters, int op_nodes) {
  bool first = true;
  while (iters > 0) {
  - Graph* graph = new Graph(OpRegistry::Global());
  - InitGraph(s, graph);
  + std::unique_ptr<Graph> graph(new Graph(OpRegistry::Global()));
  + InitGraph(s, graph.get());
  int N = graph->num_node_ids();
  if (first) {
  testing::SetLabel(strings::StrCat("Per graph node. Nodes: ", N));
  @@ -5153,7 +5153,7 @@ static void BM_MklLayoutRewritePass(int iters, int op_nodes) {
  }
  {
  testing::StartTiming();
  - std::unique_ptr<Graph> ug(graph);
  + std::unique_ptr<Graph> ug(graph.get());
  RunMklLayoutRewritePass(&ug);
  testing::StopTiming();
  }
  