Hide private stuff into .cc file

chrome/browser/chromeos/locale_change_guard.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_CHROMEOS_LOCALE_CHANGE_GUARD_H_
 #define CHROME_BROWSER_CHROMEOS_LOCALE_CHANGE_GUARD_H_
 #pragma once
 
 #include "base/lazy_instance.h"
 #include "base/scoped_ptr.h"
-#include "chrome/browser/chromeos/notifications/system_notification.h"
-#include "chrome/browser/notifications/notification_delegate.h"
 #include "chrome/browser/profiles/profile.h"
 
 class ListValue;
 class TabContents;
 
 namespace chromeos {
 
+class SystemNotification;
+
 class LocaleChangeGuard {
  public:
   // When called first time for user profile: performs check whether
   // locale has been changed automatically recently (based on synchronized user
   // preference).  If so: shows notification that allows user to revert change.
   // On subsequent calls: does nothing (hopefully fast).
   static void Check(TabContents* tab_contents);
 
  private:
-  class Delegate : public NotificationDelegate {
-   public:
-    explicit Delegate(chromeos::LocaleChangeGuard* master) : master_(master) {}
-    void Close(bool by_user);
-    void Display() {}
-    void Error() {}
-    void Click() {}
-    std::string id() const;
-
-   private:
-    chromeos::LocaleChangeGuard* master_;
-
-    DISALLOW_COPY_AND_ASSIGN(Delegate);
-  };
+  class Delegate;
 
   LocaleChangeGuard();
   void CheckLocaleChange(TabContents* tab_contents);
   void RevertLocaleChange(const ListValue* list);
   void AcceptLocaleChange();
 
   std::string from_locale_;
   std::string to_locale_;
   ProfileId profile_id_;
   TabContents* tab_contents_;
   scoped_ptr<chromeos::SystemNotification> note_;
   bool reverted_;
 
   friend struct base::DefaultLazyInstanceTraits<LocaleChangeGuard>;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOCALE_CHANGE_GUARD_H_