[C++11 Allowed Features] Declares a type-safe null pointer converting from NULL to nullptr in src/…

cc/layers/layer_perftest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/layers/layer.h"
 
 #include "cc/debug/lap_timer.h"
 #include "cc/resources/layer_painter.h"
 #include "cc/test/fake_impl_proxy.h"
 #include "cc/test/fake_layer_tree_host.h"
@@ skipping 27 matching lines @@
                kTimeCheckInterval) {}
 
  protected:
   virtual void SetUp() override {
     layer_tree_host_ = FakeLayerTreeHost::Create(&fake_client_);
     layer_tree_host_->InitializeSingleThreaded(
         &fake_client_, base::MessageLoopProxy::current());
   }
 
   virtual void TearDown() override {
-    layer_tree_host_->SetRootLayer(NULL);
+    layer_tree_host_->SetRootLayer(nullptr);
     layer_tree_host_ = nullptr;
   }
 
   FakeImplProxy proxy_;
   TestSharedBitmapManager shared_bitmap_manager_;
   FakeLayerTreeHostImpl host_impl_;
 
   FakeLayerTreeHostClient fake_client_;
   scoped_ptr<FakeLayerTreeHost> layer_tree_host_;
   LapTimer timer_;
@@ skipping 54 matching lines @@
                          "",
                          "props_didnt_change",
                          timer_.LapsPerSecond(),
                          "runs/s",
                          true);
 }
 
 
 }  // namespace
 }  // namespace cc