C++11 declares a type safe null pointer

content/common/gpu/client/gl_helper_benchmark.cc

 // Copyright (c) 2012 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.
 
 // This file looks like a unit test, but it contains benchmarks and test
 // utilities intended for manual evaluation of the scalers in
 // gl_helper*. These tests produce output in the form of files and printouts,
 // but cannot really "fail". There is no point in making these tests part
 // of any test automation run.
 
@@ skipping 54 matching lines @@
 
     helper_.reset(
         new content::GLHelper(context_->GetGLInterface(),
                               context_->GetContextSupport()));
     helper_scaling_.reset(new content::GLHelperScaling(
         context_->GetGLInterface(),
         helper_.get()));
   }
 
   virtual void TearDown() {
-    helper_scaling_.reset(NULL);
-    helper_.reset(NULL);
-    context_.reset(NULL);
+    helper_scaling_.reset(nullptr);
+    helper_.reset(nullptr);
+    context_.reset(nullptr);
   }
 
 
   void LoadPngFileToSkBitmap(const base::FilePath& filename,
                              SkBitmap* bitmap) {
     std::string compressed;
     base::ReadFileToString(base::MakeAbsoluteFilePath(filename), &compressed);
     ASSERT_TRUE(compressed.size());
     ASSERT_TRUE(gfx::PNGCodec::Decode(
         reinterpret_cast<const unsigned char*>(compressed.data()),
@@ skipping 210 matching lines @@
 int main(int argc, char** argv) {
   base::CommandLine::Init(argc, argv);
   base::TestSuite* suite = new content::ContentTestSuite(argc, argv);
 #if defined(OS_MACOSX)
   base::mac::ScopedNSAutoreleasePool pool;
 #endif
   gfx::GLSurface::InitializeOneOff();
 
   return content::UnitTestTestSuite(suite).Run();
 }