[translate] Add translate ranker model loader.

components/translate/core/browser/translate_manager.cc

 // Copyright 2014 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 "components/translate/core/browser/translate_manager.h"
 
 #include <map>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 122 matching lines @@
     TranslateClient* translate_client,
     const std::string& accept_languages_pref_name)
     : page_seq_no_(0),
       accept_languages_pref_name_(accept_languages_pref_name),
       translate_client_(translate_client),
       translate_driver_(translate_client_->GetTranslateDriver()),
       language_state_(translate_driver_),
       translate_event_(base::MakeUnique<metrics::TranslateEventProto>()),
       weak_method_factory_(this) {
   if (TranslateRanker::IsEnabled())
-    TranslateRanker::GetInstance()->FetchModelData();  // Asynchronous.
+    TranslateRanker::GetInstance()->StartModelLoader();  // Asynchronous.
 }
 
 base::WeakPtr<TranslateManager> TranslateManager::GetWeakPtr() {
   return weak_method_factory_.GetWeakPtr();
 }
 
 void TranslateManager::InitiateTranslation(const std::string& page_lang) {
   // TODO(rogerm): Remove ScopedTracker below once crbug.com/646711 is closed.
   tracked_objects::ScopedTracker tracking_profile(
       FROM_HERE_WITH_EXPLICIT_FUNCTION(
@@ skipping 444 matching lines @@
 void TranslateManager::RecordTranslateEvent(int event_type) {
   DCHECK(metrics::TranslateEventProto::EventType_IsValid(event_type));
   translate_event_->set_event_type(
       static_cast<metrics::TranslateEventProto::EventType>(event_type));
   translate_event_->set_event_timestamp_sec(
       (base::TimeTicks::Now() - base::TimeTicks()).InSeconds());
   TranslateRanker::GetInstance()->RecordTranslateEvent(*translate_event_);
 }
 
 }  // namespace translate