[Translate] Factor out access to Accept-Languages

chrome/browser/translate/chrome_translate_client.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 "chrome/browser/translate/chrome_translate_client.h"
 
 #include <vector>
 
 #include "base/logging.h"
 #include "base/path_service.h"
@@ skipping 133 matching lines @@
   if (!web_contents->GetBrowserContext()->IsOffTheRecord()) {
     std::string auto_translate_language =
         translate::TranslateManager::GetAutoTargetLanguage(
             *source, translate_prefs.get());
     if (!auto_translate_language.empty()) {
       *target = auto_translate_language;
       return;
     }
   }
 
-  std::string accept_languages_str = prefs->GetString(prefs::kAcceptLanguages);
-  std::vector<std::string> accept_languages_list = base::SplitString(
-      accept_languages_str, ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
   *target =
-      translate::TranslateManager::GetTargetLanguage(accept_languages_list);
+      translate::TranslateManager::GetTargetLanguage(translate_prefs.get());
 }
 
 translate::TranslateManager* ChromeTranslateClient::GetTranslateManager() {
   return translate_manager_.get();
 }
 
 void ChromeTranslateClient::ShowTranslateUI(
     translate::TranslateStep step,
     const std::string& source_language,
     const std::string& target_language,
@@ skipping 166 matching lines @@
     if (GetLanguageState().InTranslateNavigation())
       return;
   }
 
   TranslateBubbleFactory::Show(
       browser->window(), web_contents(), step, error_type);
 #else
   NOTREACHED();
 #endif
 }