TranslateManager is no longer a singleton

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 TranslateAcceptLanguages;
 class TranslatePrefs;
+class TranslateManager;
 
 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);
 
   // Helper method to return the TranslateAcceptLanguages instance associated
   // with |browser_context|.
   static TranslateAcceptLanguages* GetTranslateAcceptLanguages(
       content::BrowserContext* browser_context);
 
+  // Helper method to return the TranslateManager instance associated with
+  // |web_contents|, or NULL if there is no such associated instance.
+  static TranslateManager* GetManagerFromWebContents(
+      content::WebContents* web_contents);
+
+  // Gets the associated TranslateManager.
+  TranslateManager* GetTranslateManager();
+
+  // Gets the associated WebContents. Returns NULL if the WebContents is being
+  // destroyed.
+  content::WebContents* GetWebContents();
+
   // 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|.
   void ShowTranslateUI(TranslateStep step,
-                       content::WebContents* web_contents,
                        const std::string source_language,
                        const std::string target_language,
                        TranslateErrors::Type error_type);
 
  private:
   explicit TranslateTabHelper(content::WebContents* web_contents);
   friend class content::WebContentsUserData<TranslateTabHelper>;
 
   // content::WebContentsObserver implementation.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
   virtual void DidNavigateAnyFrame(
       const content::LoadCommittedDetails& details,
       const content::FrameNavigateParams& params) OVERRIDE;
+  virtual void WebContentsDestroyed(
+      content::WebContents* web_contents) OVERRIDE;
 
   void OnLanguageDetermined(const LanguageDetectionDetails& details,
                             bool page_needs_translation);
   void OnPageTranslated(int32 page_id,
                         const std::string& original_lang,
                         const std::string& translated_lang,
                         TranslateErrors::Type error_type);
 
   // Shows the translate bubble.
-  void ShowBubble(content::WebContents* web_contents,
-                  TranslateStep step,
-                  TranslateErrors::Type error_type);
+  void ShowBubble(TranslateStep step, TranslateErrors::Type error_type);
 
   ContentTranslateDriver translate_driver_;
+  scoped_ptr<TranslateManager> translate_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(TranslateTabHelper);
 };
 
 #endif  // CHROME_BROWSER_TRANSLATE_TRANSLATE_TAB_HELPER_H_