Add crashtest

layout/xul/base/src/crashtests/360642-1.xul

@@ -0,0 +1,9 @@
+<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" 
+        class="reftest-wait"
+        onload="setTimeout(function() { var foo = document.getElementById('foo'); foo.parentNode.removeChild(foo); document.documentElement.removeAttribute('class'); }, 30);">
+        
+  <listboxbody>
+    <hbox id="foo"/>
+  </listboxbody>
+  
+</window>

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

@@ -5,6 +5,7 @@ load 329407-1.xml
 load 344228-1.xul
 load 346083-1.html
 load 346281-1.html
+load 360642-1.xul
 load 366112-1.xul
 load 377592-1.svg
 load 382899-1.xul