Move TranslatePrefs to the Translate component

chrome/browser/translate/translate_tab_helper.h

 // Copyright 2011 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 CHROME_BROWSER_TRANSLATE_TRANSLATE_TAB_HELPER_H_
 #define CHROME_BROWSER_TRANSLATE_TRANSLATE_TAB_HELPER_H_
 
 #include <string>
 
+#include "base/memory/scoped_ptr.h"
 #include "chrome/browser/ui/translate/translate_bubble_model.h"
 #include "components/translate/content/browser/content_translate_driver.h"
 #include "components/translate/core/common/translate_errors.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
 
 namespace content {
+class BrowserContext;
 class WebContents;
 }
 
 struct LanguageDetectionDetails;
+class PrefService;
+class TranslatePrefs;
 
 class TranslateTabHelper
     : public content::WebContentsObserver,
       public content::WebContentsUserData<TranslateTabHelper> {
  public:
   virtual ~TranslateTabHelper();
 
   // Gets the LanguageState associated with the page.
   LanguageState& GetLanguageState();
 
   // Returns the ContentTranslateDriver instance associated with this
   // WebContents.
   ContentTranslateDriver& translate_driver() { return translate_driver_; }
 
+  // Helper method to return a new TranslatePrefs instance.
+  static scoped_ptr<TranslatePrefs> CreateTranslatePrefs(PrefService* prefs);
+
+  // Returns true if the passed language has been configured by the user as an
+  // accept language. |language| will be converted if it has the synonym of

[blundell, 2014/02/12 14:01:43]

I don't understand the second sentence here.

+  // accept languages.
+  static bool IsAcceptLanguage(content::BrowserContext* browser_context,
+                               const std::string& language);
+
   // Denotes which state the user is in with respect to translate.
   enum TranslateStep {
     BEFORE_TRANSLATE,
     TRANSLATING,
     AFTER_TRANSLATE,
     TRANSLATE_ERROR
   };
 
   // Called when the embedder should present UI to the user corresponding to the
   // user's current |step|.
@@ skipping 24 matching lines @@
   void ShowBubble(content::WebContents* web_contents,
                   TranslateBubbleModel::ViewState view_state,
                   TranslateErrors::Type error_type);
 
   ContentTranslateDriver translate_driver_;
 
   DISALLOW_COPY_AND_ASSIGN(TranslateTabHelper);
 };
 
 #endif  // CHROME_BROWSER_TRANSLATE_TRANSLATE_TAB_HELPER_H_