HistoryService::Init() receives the list of languages

chrome/test/base/testing_profile.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/test/base/testing_profile.h"
 
 #include "base/base_paths.h"
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/message_loop/message_loop_proxy.h"
@@ skipping 550 matching lines @@
     base::FilePath path = GetPath();
     path = path.Append(history::kHistoryFilename);
     if (!base::DeleteFile(path, false) || base::PathExists(path))
       return false;
   }
   // This will create and init the history service.
   HistoryService* history_service = static_cast<HistoryService*>(
       HistoryServiceFactory::GetInstance()->SetTestingFactoryAndUse(
           this, BuildHistoryService));
   if (!history_service->Init(
-          no_db, history::HistoryDatabaseParamsForPath(this->GetPath()))) {
+          no_db, GetPrefs()->GetString(prefs::kAcceptLanguages),
+          history::HistoryDatabaseParamsForPath(GetPath()))) {
     HistoryServiceFactory::GetInstance()->SetTestingFactory(this, nullptr);
     return false;
   }
   // Disable WebHistoryService by default, since it makes network requests.
   WebHistoryServiceFactory::GetInstance()->SetTestingFactory(this, nullptr);
   return true;
 }
 
 void TestingProfile::DestroyHistoryService() {
   HistoryService* history_service =
@@ skipping 501 matching lines @@
 #if defined(ENABLE_EXTENSIONS)
                             extension_policy_,
 #endif
                             pref_service_.Pass(),
                             original_profile,
                             guest_session_,
                             supervised_user_id_,
                             policy_service_.Pass(),
                             testing_factories_);
 }