Make Use of Value::GetList API

components/ntp_snippets/pref_util.cc

 // Copyright 2016 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 "components/ntp_snippets/pref_util.h"
 
 #include <memory>
 
 #include "base/values.h"
 #include "components/prefs/pref_service.h"
 
 namespace ntp_snippets {
 namespace prefs {
 
 std::set<std::string> ReadDismissedIDsFromPrefs(const PrefService& pref_service,
                                                 const std::string& pref_name) {
   std::set<std::string> dismissed_ids;
-  const base::ListValue* list = pref_service.GetList(pref_name);
-  for (const base::Value& value : *list) {
+  const base::Value* list = pref_service.GetList(pref_name);
+  for (const base::Value& value : list->GetList()) {
     std::string dismissed_id;
     bool success = value.GetAsString(&dismissed_id);
     DCHECK(success) << "Failed to parse dismissed id from prefs param "
                     << pref_name << " into string.";
     dismissed_ids.insert(dismissed_id);
   }
   return dismissed_ids;
 }
 
 void StoreDismissedIDsToPrefs(PrefService* pref_service,
                               const std::string& pref_name,
                               const std::set<std::string>& dismissed_ids) {
-  base::ListValue list;
+  base::Value list(base::Value::Type::LIST);
   for (const std::string& dismissed_id : dismissed_ids) {
-    list.AppendString(dismissed_id);
+    list.GetList().emplace_back(dismissed_id);
   }
   pref_service->Set(pref_name, list);
 }
 
 }  // namespace prefs
 }  // namespace ntp_snippets