Add crashtest

layout/xul/base/src/grid/crashtests/321066-1.xul

@@ -0,0 +1,8 @@
+<?xml version="1.0"?>
+<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+  <grid>
+    <rows>
+      <column/>
+    </rows>
+  </grid>
+</window>

layout/xul/base/src/grid/crashtests/crashtests.list

@@ -1,6 +1,7 @@
 load 306911-crash.xul
 load 306911-grid-testcases.xul
 load 306911-grid-testcases2.xul
+load 321066-1.xul
 load 321073-1.xul
 load 382750-1.xul
 load 400790-1.xul