Address post-submit comments from http://codereview.chromium.org/327009 .

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/common/notification_registrar.h"
 
 class NavigationController;
+@class RepostDelegate;
 class RepostFormWarningMac;
 
-@interface RepostDelegate : NSObject {
-  RepostFormWarningMac* warning_;  // weak, owns us.
-}
-- (id)initWithWarning:(RepostFormWarningMac*)warning;
-- (void)alertDidEnd:(NSAlert*)alert
-         returnCode:(int)returnCode
-        contextInfo:(void*)contextInfo;
-@end
-
+// 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 {
  public:
   RepostFormWarningMac(NSWindow* parent,
                        NavigationController* navigation_controller);
   virtual ~RepostFormWarningMac();
 
   void Confirm();
   void Cancel();
 
  private:
@@ skipping 13 matching lines @@
   NavigationController* navigation_controller_;
 
   scoped_nsobject<NSAlert> alert_;
   
   scoped_nsobject<RepostDelegate> delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(RepostFormWarningMac);
 };
 
 #endif  // CHROME_BROWSER_COCOA_REPOST_FORM_WARNING_MAC_H_