Make repost form warning tab-modal on Mac.

chrome/browser/cocoa/repost_form_warning_mac.h

 // Copyright (c) 2009 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_COCOA_REPOST_FORM_WARNING_MAC_H_
 #define CHROME_BROWSER_COCOA_REPOST_FORM_WARNING_MAC_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/scoped_nsobject.h"
+#include "chrome/browser/tab_contents/tab_contents.h"
+#include "chrome/browser/cocoa/constrained_window_mac.h"
 #include "chrome/common/notification_registrar.h"
 
 class NavigationController;
 @class RepostDelegate;
 class RepostFormWarningMac;
 
 // Displays a dialog that warns the user that they are about to resubmit a form.
 // To display the dialog, allocate this object on the heap. It will open the
 // dialog from its constructor and then delete itself when the user dismisses
 // the dialog.
-class RepostFormWarningMac : public NotificationObserver {
+class RepostFormWarningMac : public NotificationObserver,
+                             public ConstrainedWindowMacDelegateSystemSheet {
  public:
   RepostFormWarningMac(NSWindow* parent,
-                       NavigationController* navigation_controller);
+                       TabContents* tab_contents);
   virtual ~RepostFormWarningMac();
 
+  virtual void DeleteDelegate();
+
   void Confirm();
   void Cancel();
 
  private:
   // NotificationObserver implementation.
   // Watch for a new load or a closed tab and dismiss the dialog if they occur.
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
 
-  // Close the sheet.  This will only be done once, even if Destroy is called
+  // Close the sheet.
+  void Dismiss();
+  // Clean up.  This will only be done once, even if Destroy is called
   // multiple times (eg, from both Confirm and Observe.)
   void Destroy();
 
   NotificationRegistrar registrar_;
 
   // Navigation controller, used to continue the reload.
   NavigationController* navigation_controller_;
 
-  scoped_nsobject<NSAlert> alert_;
-
-  scoped_nsobject<RepostDelegate> delegate_;
+  ConstrainedWindow* window_;
 
   DISALLOW_COPY_AND_ASSIGN(RepostFormWarningMac);
 };
 
 #endif  // CHROME_BROWSER_COCOA_REPOST_FORM_WARNING_MAC_H_