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

chrome/browser/ui/webui/settings/search_engines_handler.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_SETTINGS_SEARCH_ENGINES_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_SETTINGS_SEARCH_ENGINES_HANDLER_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 65 matching lines @@
   void HandleSearchEngineEditCancelled(const base::ListValue* args);
 
   // Called when an edit is finished and should be saved.
   // Called from WebUI.
   void HandleSearchEngineEditCompleted(const base::ListValue* args);
 
   // Disables a Chrome (omnibox) extension.
   void HandleDisableExtension(const base::ListValue* args);
 
   // Returns a dictionary to pass to WebUI representing the given search engine.
-  base::DictionaryValue* CreateDictionaryForEngine(int index, bool is_default);
+  std::unique_ptr<base::DictionaryValue> CreateDictionaryForEngine(
+      int index,
+      bool is_default);
 
   // Returns a dictionary to pass to WebUI representing the extension.
   base::DictionaryValue* CreateDictionaryForExtension(
       const extensions::Extension& extension);
 
   Profile* const profile_;
 
   KeywordEditorController list_controller_;
   std::unique_ptr<EditSearchEngineController> edit_controller_;
 
   DISALLOW_COPY_AND_ASSIGN(SearchEnginesHandler);
 };
 
 }  // namespace settings
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SETTINGS_SEARCH_ENGINES_HANDLER_H_