[Translate] Factor out access to Accept-Languages

components/translate/core/browser/translate_manager.h

 // 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.
 
 #ifndef COMPONENTS_TRANSLATE_CORE_BROWSER_TRANSLATE_MANAGER_H_
 #define COMPONENTS_TRANSLATE_CORE_BROWSER_TRANSLATE_MANAGER_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 36 matching lines @@
   // Sets the sequence number of the current page, for use while sending
   // messages to the renderer.
   void set_current_seq_no(int page_seq_no) { page_seq_no_ = page_seq_no; }
 
   // Returns the language to translate to. The language returned is the
   // first language found in the following list that is supported by the
   // translation service:
   //     the UI language
   //     the accept-language list
   // If no language is found then an empty string is returned.
-  static std::string GetTargetLanguage(
-      const std::vector<std::string>& accept_languages_list);
+  static std::string GetTargetLanguage(const TranslatePrefs* prefs);
 
   // Returns the language to automatically translate to. |original_language| is
   // the webpage's original language.
   static std::string GetAutoTargetLanguage(const std::string& original_language,
                                            TranslatePrefs* translate_prefs);
 
   // Translates the page contents from |source_lang| to |target_lang|.
   // The actual translation might be performed asynchronously if the translate
   // script is not yet available.
   void TranslatePage(const std::string& source_lang,
@@ skipping 62 matching lines @@
   // By default, don't offer to translate in builds lacking an API key. For
   // testing, set to true to offer anyway.
   static bool ignore_missing_key_for_testing_;
 
   DISALLOW_COPY_AND_ASSIGN(TranslateManager);
 };
 
 }  // namespace translate
 
 #endif  // COMPONENTS_TRANSLATE_CORE_BROWSER_TRANSLATE_MANAGER_H_