C++11 declares a type safe null pointer

content/common/url_schemes.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.
 
 #include "content/common/url_schemes.h"
 
 #include <string.h>
 
 #include <algorithm>
 #include <string>
@@ skipping 34 matching lines @@
   // prevent accidental creation of data races in the program. AddStandardScheme
   // isn't threadsafe so must be called when GURL isn't used on any other
   // thread. This is really easy to mess up, so we say that all calls to
   // AddStandardScheme in Chrome must be inside this function.
   if (lock_standard_schemes)
     url::LockStandardSchemes();
 
   // We rely on the above lock to protect this part from being invoked twice.
   if (!additional_savable_schemes.empty()) {
     const char* const* default_schemes = GetSavableSchemesInternal();
-    const char* const* default_schemes_end = NULL;
+    const char* const* default_schemes_end = nullptr;
     for (default_schemes_end = default_schemes; *default_schemes_end;
          ++default_schemes_end) {}
     const int default_schemes_count = default_schemes_end - default_schemes;
 
     int schemes = static_cast<int>(additional_savable_schemes.size());
     // The array, and the copied schemes won't be freed, but will remain
     // reachable.
     char **savable_schemes = new char*[schemes + default_schemes_count + 1];
     memcpy(savable_schemes,
            default_schemes,
            default_schemes_count * sizeof(default_schemes[0]));
     for (int i = 0; i < schemes; ++i) {
       savable_schemes[default_schemes_count + i] =
           base::strdup(additional_savable_schemes[i].c_str());
     }
     savable_schemes[default_schemes_count + schemes] = 0;
 
     SetSavableSchemes(savable_schemes);
   }
 }
 
 }  // namespace content