Ensure proper teardown of repost form warning objects.

chrome/browser/gtk/repost_form_warning_gtk.cc

Index: chrome/browser/gtk/repost_form_warning_gtk.cc
diff --git a/chrome/browser/gtk/repost_form_warning_gtk.cc b/chrome/browser/gtk/repost_form_warning_gtk.cc
index 2c3e0107170fab4aa7704f78030fdce0553a28f2..44d70d002216db30778bea33165f22f0bcc60e10 100644
--- a/chrome/browser/gtk/repost_form_warning_gtk.cc
+++ b/chrome/browser/gtk/repost_form_warning_gtk.cc
@@ -65,18 +65,11 @@ GtkWidget* RepostFormWarningGtk::GetWidgetRoot() {
 }
 
 void RepostFormWarningGtk::DeleteDelegate() {
-  Dismiss();
   delete this;
 }
 
 RepostFormWarningGtk::~RepostFormWarningGtk() {
-}
-
-void RepostFormWarningGtk::Dismiss() {
-  if (dialog_) {
-    gtk_widget_destroy(dialog_);
-    dialog_ = NULL;
-  }
+  gtk_widget_destroy(dialog_);
 }
 
 void RepostFormWarningGtk::OnRefresh(GtkWidget* widget) {