C++11 declares a type safe null pointer

content/common/gpu/client/gpu_in_process_context_tests.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 <stdio.h>
 #include <cmath>
 #include <string>
 #include <vector>
 
 #include "content/public/test/unittest_test_suite.h"
@@ skipping 11 matching lines @@
     blink::WebGraphicsContext3D::Attributes attributes;
     bool lose_context_when_out_of_memory = false;
     typedef WebGraphicsContext3DInProcessCommandBufferImpl WGC3DIPCBI;
     context_ = WGC3DIPCBI::CreateOffscreenContext(
         attributes, lose_context_when_out_of_memory);
     context_->InitializeOnCurrentThread();
     context_support_ = context_->GetContextSupport();
   }
 
   virtual void TearDown() {
-    context_.reset(NULL);
+    context_.reset(nullptr);
   }
 
  protected:
   scoped_ptr<WebGraphicsContext3DInProcessCommandBufferImpl> context_;
   gpu::ContextSupport* context_support_;
 };
 
 }  // namespace
 
 // Include the actual tests.
 #define CONTEXT_TEST_F TEST_F
 #include "content/common/gpu/client/gpu_context_tests.h"