Use std::unique_ptr for base::DictionaryValue and base::ListValue's internal store.

chrome/browser/spellchecker/spellcheck_service.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 "chrome/browser/spellchecker/spellcheck_service.h"
 
 #include <set>
 
 #include "base/logging.h"
 #include "base/strings/string_split.h"
@@ skipping 207 matching lines @@
 
 void SpellcheckService::LoadHunspellDictionaries() {
   hunspell_dictionaries_.clear();
 
   PrefService* prefs = user_prefs::UserPrefs::Get(context_);
   DCHECK(prefs);
 
   const base::ListValue* dictionary_values =
       prefs->GetList(prefs::kSpellCheckDictionaries);
 
-  for (const base::Value* dictionary_value : *dictionary_values) {
+  for (const auto& dictionary_value : *dictionary_values) {
     std::string dictionary;
     dictionary_value->GetAsString(&dictionary);
     hunspell_dictionaries_.push_back(new SpellcheckHunspellDictionary(
         dictionary,
         content::BrowserContext::GetDefaultStoragePartition(context_)->
             GetURLRequestContext(),
         this));
     hunspell_dictionaries_.back()->AddObserver(this);
     hunspell_dictionaries_.back()->Load();
   }
@@ skipping 139 matching lines @@
   chrome::spellcheck_common::GetISOLanguageCountryCodeFromLocale(
       feedback_language, &language_code, &country_code);
   feedback_sender_->OnLanguageCountryChange(language_code, country_code);
   if (SpellingServiceClient::IsAvailable(
           context_, SpellingServiceClient::SPELLCHECK)) {
     feedback_sender_->StartFeedbackCollection();
   } else {
     feedback_sender_->StopFeedbackCollection();
   }
 }