Don't use deprecated ListValue::Append(Value*) overload.

chrome/browser/ui/webui/settings/search_engines_handler.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 "chrome/browser/ui/webui/settings/search_engines_handler.h"
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 137 matching lines @@
 }
 
 void SearchEnginesHandler::OnItemsAdded(int start, int length) {
   OnModelChanged();
 }
 
 void SearchEnginesHandler::OnItemsRemoved(int start, int length) {
   OnModelChanged();
 }
 
-base::DictionaryValue* SearchEnginesHandler::CreateDictionaryForEngine(
-    int index,
-    bool is_default) {
+std::unique_ptr<base::DictionaryValue>
+SearchEnginesHandler::CreateDictionaryForEngine(int index, bool is_default) {
   TemplateURLTableModel* table_model = list_controller_.table_model();
   const TemplateURL* template_url = list_controller_.GetTemplateURL(index);
 
   // The items which are to be written into |dict| are also described in
   // chrome/browser/resources/settings/search_engines_page/
   // in @typedef for SearchEngine. Please update it whenever you add or remove
   // any keys here.
-  base::DictionaryValue* dict = new base::DictionaryValue();
+  std::unique_ptr<base::DictionaryValue> dict(new base::DictionaryValue());
   dict->SetString("name", template_url->short_name());
   dict->SetString("displayName",
                   table_model->GetText(
                       index, IDS_SEARCH_ENGINES_EDITOR_DESCRIPTION_COLUMN));
   dict->SetString(
       "keyword",
       table_model->GetText(index, IDS_SEARCH_ENGINES_EDITOR_KEYWORD_COLUMN));
   dict->SetString("url",
                   template_url->url_ref().DisplayURL(
                       UIThreadSearchTermsData(Profile::FromWebUI(web_ui()))));
@@ skipping 166 matching lines @@
   std::string extension_id;
   CHECK(args->GetString(0, &extension_id));
   ExtensionService* extension_service =
       extensions::ExtensionSystem::Get(profile_)->extension_service();
   DCHECK(extension_service);
   extension_service->DisableExtension(
       extension_id, extensions::Extension::DISABLE_USER_ACTION);
 }
 
 }  // namespace settings