Ensure proper teardown of repost form warning objects.

chrome/browser/cocoa/repost_form_warning_mac.h

Index: chrome/browser/cocoa/repost_form_warning_mac.h
diff --git a/chrome/browser/cocoa/repost_form_warning_mac.h b/chrome/browser/cocoa/repost_form_warning_mac.h
index 7139be69225eb38e28b65d0a244388af0b253b43..a1ebeeec9178af695afb97214e6a1cd7cfbc8aae 100644
--- a/chrome/browser/cocoa/repost_form_warning_mac.h
+++ b/chrome/browser/cocoa/repost_form_warning_mac.h
@@ -7,7 +7,7 @@
 
 #import <Cocoa/Cocoa.h>
 
-#include "base/scoped_nsobject.h"
+#include "base/scoped_ptr.h"
 #include "chrome/browser/cocoa/constrained_window_mac.h"
 
 class RepostFormWarningController;
@@ -31,8 +31,7 @@ class RepostFormWarningMac : public ConstrainedDialogDelegate {
  private:
   virtual ~RepostFormWarningMac();
 
-  // Close the sheet.
-  void Dismiss();
+  scoped_ptr<RepostFormWarningController> controller_;
 
   DISALLOW_COPY_AND_ASSIGN(RepostFormWarningMac);
 };