HistoryService::Init() receives the list of languages

chrome/browser/history/history_service.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.
 
 // The history system runs on a background thread so that potentially slow
 // database operations don't delay the browser. This backend processing is
 // represented by HistoryBackend. The HistoryService's job is to dispatch to
 // that thread.
 //
 // Main thread                       History thread
@@ skipping 203 matching lines @@
   const base::WeakPtr<HistoryService> history_service_;
   const scoped_refptr<base::SequencedTaskRunner> service_task_runner_;
 };
 
 // The history thread is intentionally not a BrowserThread because the
 // sync integration unit tests depend on being able to create more than one
 // history thread.
 HistoryService::HistoryService()
     : thread_(new base::Thread(kHistoryThreadName)),
       history_client_(NULL),
-      profile_(NULL),
       backend_loaded_(false),
       no_db_(false),
       weak_ptr_factory_(this) {
 }
 
-HistoryService::HistoryService(history::HistoryClient* client, Profile* profile)
+HistoryService::HistoryService(
+    history::HistoryClient* history_client, Profile* profile)
     : thread_(new base::Thread(kHistoryThreadName)),
-      history_client_(client),
-      profile_(profile),
+      history_client_(history_client),
       visitedlink_master_(new visitedlink::VisitedLinkMaster(
           profile, this, true)),
       backend_loaded_(false),
       no_db_(false),
       weak_ptr_factory_(this) {
-  DCHECK(profile_);
 }
 
 HistoryService::~HistoryService() {
   DCHECK(thread_checker_.CalledOnValidThread());
   // Shutdown the backend. This does nothing if Cleanup was already invoked.
   Cleanup();
 }
 
 bool HistoryService::BackendLoaded() {
   DCHECK(thread_checker_.CalledOnValidThread());
@@ skipping 710 matching lines @@
 void HistoryService::RebuildTable(
     const scoped_refptr<URLEnumerator>& enumerator) {
   DCHECK(thread_) << "History service being called after cleanup";
   DCHECK(thread_checker_.CalledOnValidThread());
   ScheduleTask(PRIORITY_NORMAL, base::Bind(&HistoryBackend::IterateURLs,
                                            history_backend_.get(), enumerator));
 }
 
 bool HistoryService::Init(
     bool no_db,
+    PrefService* prefs,
     const history::HistoryDatabaseParams& history_database_params) {
   DCHECK(thread_) << "History service being called after cleanup";
   DCHECK(thread_checker_.CalledOnValidThread());
   base::Thread::Options options;
   options.timer_slack = base::TIMER_SLACK_MAXIMUM;
   if (!thread_->StartWithOptions(options)) {
     Cleanup();
     return false;
   }
 
   history_dir_ = history_database_params.history_dir;
   no_db_ = no_db;
 
-  if (profile_) {
-    std::string languages =
-        profile_->GetPrefs()->GetString(prefs::kAcceptLanguages);
+  std::string languages;
+  if (prefs) {
+    // During unit testing, there may not be a PrefService.
+    languages = prefs->GetString(prefs::kAcceptLanguages);
     in_memory_url_index_.reset(new history::InMemoryURLIndex(
         this, history_dir_, languages, history_client_));
     in_memory_url_index_->Init();
   }
 
   // Create the history backend.
   scoped_refptr<HistoryBackend> backend(new HistoryBackend(
       history_dir_, new BackendDelegate(weak_ptr_factory_.GetWeakPtr(),
                                         base::ThreadTaskRunnerHandle::Get()),
       history_client_));
   history_backend_.swap(backend);
 
-  // There may not be a profile when unit testing.
-  std::string languages;
-  if (profile_) {
-    PrefService* prefs = profile_->GetPrefs();
-    languages = prefs->GetString(prefs::kAcceptLanguages);
-  }
-
   ScheduleTask(PRIORITY_UI,
                base::Bind(&HistoryBackend::Init, history_backend_.get(),
                           languages, no_db_, history_database_params));
 
   if (visitedlink_master_) {
     bool result = visitedlink_master_->Init();
     DCHECK(result);
   }
 
   return true;
@@ skipping 275 matching lines @@
     const HistoryService::OnFaviconChangedCallback& callback) {
   DCHECK(thread_checker_.CalledOnValidThread());
   return favicon_changed_callback_list_.Add(callback);
 }
 
 void HistoryService::NotifyFaviconChanged(
     const std::set<GURL>& changed_favicons) {
   DCHECK(thread_checker_.CalledOnValidThread());
   favicon_changed_callback_list_.Notify(changed_favicons);
 }