Use GetDefaultLocaleListString for returning LocaleList

android_webview/native/aw_locale_manager_impl.h

 // Copyright 2015 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 ANDROID_WEBVIEW_NATIVE_AW_LOCALE_MANAGER_IMPL_H_
 #define ANDROID_WEBVIEW_NATIVE_AW_LOCALE_MANAGER_IMPL_H_
 
 #include "android_webview/browser/aw_locale_manager.h"
 
 #include "base/macros.h"
 
 namespace android_webview {
 
 class AwLocaleManagerImpl : public AwLocaleManager {
  public:
   AwLocaleManagerImpl();
   ~AwLocaleManagerImpl() override;
 
   std::string GetLocale() override;
 
+  std::string GetLocaleList() override;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(AwLocaleManagerImpl);
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_NATIVE_AW_LOCALE_MANAGER_IMPL_H_