Fixed crash on TranslateManager with multiple profiles.

chrome/browser/translate/translate_manager.h

 // Copyright (c) 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_MANAGER_H_
 #define CHROME_BROWSER_TRANSLATE_TRANSLATE_MANAGER_H_
 #pragma once
 
 #include <map>
 #include <set>
@@ skipping 163 matching lines @@
   //     the UI language
   //     the accept-language list
   // If no language is found then an empty string is returned.
   static std::string GetTargetLanguage(PrefService* prefs);
 
   // Returns the translate info bar showing in |tab| or NULL if none is showing.
   static TranslateInfoBarDelegate* GetTranslateInfoBarDelegate(
       TabContents* tab);
 
   NotificationRegistrar notification_registrar_;
-  PrefChangeRegistrar pref_change_registrar_;
+
+  // Each PrefChangeRegistrar only tracks a single PrefService, so a map from
+  // each PrefService used to its registrar is needed.
+  typedef std::map<PrefService*, PrefChangeRegistrar*> PrefServiceRegistrarMap;
+  PrefServiceRegistrarMap pref_change_registrars_;
 
   // A map that associates a profile with its parsed "accept languages".
   typedef std::set<std::string> LanguageSet;
   typedef std::map<PrefService*, LanguageSet> PrefServiceLanguagesMap;
   PrefServiceLanguagesMap accept_languages_;
 
   ScopedRunnableMethodFactory<TranslateManager> method_factory_;
 
   // The JS injected in the page to do the translation.
   std::string translate_script_;
@@ skipping 14 matching lines @@
   // server.
   std::vector<PendingRequest> pending_requests_;
 
   // The languages supported by the translation server.
   static base::LazyInstance<std::set<std::string> > supported_languages_;
 
   DISALLOW_COPY_AND_ASSIGN(TranslateManager);
 };
 
 #endif  // CHROME_BROWSER_TRANSLATE_TRANSLATE_MANAGER_H_