gtk: Fix use after free

chrome/browser/ui/gtk/omnibox/omnibox_popup_view_gtk.h

Index: chrome/browser/ui/gtk/omnibox/omnibox_popup_view_gtk.h
diff --git a/chrome/browser/ui/gtk/omnibox/omnibox_popup_view_gtk.h b/chrome/browser/ui/gtk/omnibox/omnibox_popup_view_gtk.h
index 0b6d4b2889ee4d2dfcfe9d58f24c986e41bb57e5..fcb6611d66fba2a7e8c02c7cfdc6e2c32c666629 100644
--- a/chrome/browser/ui/gtk/omnibox/omnibox_popup_view_gtk.h
+++ b/chrome/browser/ui/gtk/omnibox/omnibox_popup_view_gtk.h
@@ -31,10 +31,6 @@ namespace gfx {
 class Image;
 }
 
-namespace ui {
-class GtkSignalRegistrar;
-}
-
 class OmniboxPopupViewGtk : public OmniboxPopupView,
                             public content::NotificationObserver {
  public:
@@ -104,7 +100,6 @@ class OmniboxPopupViewGtk : public OmniboxPopupView,
   CHROMEGTK_CALLBACK_1(OmniboxPopupViewGtk, gboolean, HandleExpose,
                        GdkEventExpose*);
 
-  scoped_ptr<ui::GtkSignalRegistrar> signal_registrar_;
   scoped_ptr<OmniboxPopupModel> model_;
   OmniboxView* omnibox_view_;
   GtkWidget* location_bar_;