Run clang-modernize -use-nullptr over src/extensions/.

extensions/browser/extension_pref_store.cc

 // Copyright 2014 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 "extensions/browser/extension_pref_store.h"
 
 #include "base/values.h"
 #include "extensions/browser/extension_pref_value_map.h"
 
 ExtensionPrefStore::ExtensionPrefStore(
     ExtensionPrefValueMap* extension_pref_value_map,
     bool incognito_pref_store)
     : extension_pref_value_map_(extension_pref_value_map),
       incognito_pref_store_(incognito_pref_store) {
   extension_pref_value_map_->AddObserver(this);
 }
 
 void ExtensionPrefStore::OnInitializationCompleted() {
   NotifyInitializationCompleted();
 }
 
 void ExtensionPrefStore::OnPrefValueChanged(const std::string& key) {
   CHECK(extension_pref_value_map_);
-  const base::Value *winner =
-      extension_pref_value_map_->GetEffectivePrefValue(key,
-                                                       incognito_pref_store_,
-                                                       NULL);
+  const base::Value* winner = extension_pref_value_map_->GetEffectivePrefValue(
+      key, incognito_pref_store_, nullptr);
   if (winner)
     SetValue(key, winner->DeepCopy());
   else
     RemoveValue(key);
 }
 
 void ExtensionPrefStore::OnExtensionPrefValueMapDestruction() {
   CHECK(extension_pref_value_map_);
   extension_pref_value_map_->RemoveObserver(this);
-  extension_pref_value_map_ = NULL;
+  extension_pref_value_map_ = nullptr;
 }
 
 ExtensionPrefStore::~ExtensionPrefStore() {
   if (extension_pref_value_map_)
     extension_pref_value_map_->RemoveObserver(this);
 }