Unref the GC so it's destroy after we create it.

Review URL: http://codereview.chromium.org/99190


git-svn-id: svn://svn.chromium.org/chrome/trunk/src@14848 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/autocomplete/autocomplete_popup_view_gtk.cc

@@ -469,5 +469,7 @@ gboolean AutocompletePopupViewGtk::HandleExpose(GtkWidget* widget,
     }
   }
 
+  g_object_unref(gc);
+
   return TRUE;
 }