C++11 declares a type safe null pointer

content/common/cursors/webcursor_aurawin.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/cursors/webcursor.h"
 
 #include <windows.h>
 
 #include "third_party/WebKit/public/platform/WebCursorInfo.h"
 #include "ui/gfx/icon_util.h"
 
 namespace content {
 
 ui::PlatformCursor WebCursor::GetPlatformCursor() {
   if (!IsCustom())
-    return LoadCursor(NULL, IDC_ARROW);
+    return LoadCursor(nullptr, IDC_ARROW);
 
   if (custom_cursor_)
     return custom_cursor_;
 
   custom_cursor_ =
       IconUtil::CreateCursorFromDIB(
           custom_size_,
           hotspot_,
-          !custom_data_.empty() ? &custom_data_[0] : NULL,
+          !custom_data_.empty() ? &custom_data_[0] : nullptr,
           custom_data_.size());
   return custom_cursor_;
 }
 
 void WebCursor::SetDisplayInfo(const gfx::Display& display) {
   // TODO(winguru): Add support for scaling the cursor.
 }
 
 void WebCursor::InitPlatformData() {
-  custom_cursor_ = NULL;
+  custom_cursor_ = nullptr;
 }
 
 bool WebCursor::SerializePlatformData(Pickle* pickle) const {
   return true;
 }
 
 bool WebCursor::DeserializePlatformData(PickleIterator* iter) {
   return true;
 }
 
 bool WebCursor::IsPlatformDataEqual(const WebCursor& other) const {
   return true;
 }
 
 void WebCursor::CleanupPlatformData() {
   if (custom_cursor_) {
     DestroyIcon(custom_cursor_);
-    custom_cursor_ = NULL;
+    custom_cursor_ = nullptr;
   }
 }
 
 void WebCursor::CopyPlatformData(const WebCursor& other) {
 }
 
 }  // namespace content