Implemented 'Reset Search engines' feature.

chrome/browser/profile_resetter/profile_resetter.h

 // Copyright (c) 2013 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_PROFILE_RESETTER_PROFILE_RESETTER_H_
 #define CHROME_BROWSER_PROFILE_RESETTER_PROFILE_RESETTER_H_
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/threading/non_thread_safe.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
 
 class Profile;
+class TemplateURLService;
 
 // This class allows resetting certain aspects of a profile to default values.
 // It is used in case the profile has been damaged due to malware or bad user
 // settings.
-class ProfileResetter : public base::NonThreadSafe {
+class ProfileResetter : public base::NonThreadSafe,
+                        public content::NotificationObserver {
  public:
   // Flags indicating what aspects of a profile shall be reset.
   enum Resettable {
     DEFAULT_SEARCH_ENGINE = 1 << 0,
     HOMEPAGE = 1 << 1,
     CONTENT_SETTINGS = 1 << 2,
     COOKIES_AND_SITE_DATA = 1 << 3,
     EXTENSIONS = 1 << 4,
     STARTUP_PAGE = 1 << 5,
     // Update ALL if you add new values and check whether the type of
     // ResettableFlags needs to be enlarged.
     ALL = DEFAULT_SEARCH_ENGINE | HOMEPAGE | CONTENT_SETTINGS |
           COOKIES_AND_SITE_DATA | EXTENSIONS | STARTUP_PAGE
   };
 
   // How to handle extensions that shall be reset.
   enum ExtensionHandling {
     DISABLE_EXTENSIONS,
     UNINSTALL_EXTENSIONS
   };
 
   // Bit vector for Resettable enum.
   typedef uint32 ResettableFlags;
 
   COMPILE_ASSERT(sizeof(ResettableFlags) == sizeof(Resettable),
                  type_ResettableFlags_doesnt_match_Resettable);
 
   explicit ProfileResetter(Profile* profile);
-  ~ProfileResetter();
+  virtual ~ProfileResetter();
 
   // Resets |resettable_flags| and calls |callback| on the UI thread on
   // completion. If |resettable_flags| contains EXTENSIONS, these are handled
   // according to |extension_handling|.
   void Reset(ResettableFlags resettable_flags,
              ExtensionHandling extension_handling,
              const base::Closure& callback);
 
   bool IsActive() const;
 
  private:
   // Marks |resettable| as done and triggers |callback_| if all pending jobs
   // have completed.
   void MarkAsDone(Resettable resettable);
 
   void ResetDefaultSearchEngine();
   void ResetHomepage();
   void ResetContentSettings();
   void ResetCookiesAndSiteData();
   void ResetExtensions(ExtensionHandling extension_handling);
   void ResetStartPage();
 
+  // content::NotificationObserver:
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
   Profile* profile_;
+  TemplateURLService* template_url_service_;
 
   // Flags of a Resetable indicating which reset operations we are still waiting
   // for.
   ResettableFlags pending_reset_flags_;
 
   // Called on UI thread when reset has been completed.
   base::Closure callback_;
 
+  content::NotificationRegistrar registrar_;
+
   DISALLOW_COPY_AND_ASSIGN(ProfileResetter);
 };
 
 #endif  // CHROME_BROWSER_PROFILE_RESETTER_PROFILE_RESETTER_H_