Skip 'accessibilityController' property in the cached properties test

LayoutTests/fast/dom/Window/resources/window-property-collector.js

 function collectProperties()
 {
     // Collect properties of the top-level window, since touching the properties
     // of a DOMWindow affects its internal C++ state.
     collectPropertiesHelper(window, []);
 
     propertiesToVerify.sort(function (a, b)
     {
         if (a.property < b.property)
             return -1
@@ skipping 44 matching lines @@
         break;
     }
 
     insertExpectedResult(path, expected);
 }
 
 function collectPropertiesHelper(object, path)
 {
     if (path.length > 20)
         throw 'Error: probably looping';
+
     for (var property in object) {
+        // Skip the properties which are hard to expect a stable result.
+        // As for 'accessibilityController', we can hardly estimate the states
+        // of the cached WebAXObjects.
+        if (property == 'accessibilityController')
+            continue;
         if (!object[property])
             continue;
         path.push(property);
         var type = typeof(object[property]);
         if (type == "object") {
             // Skip some traversing through types that will end up in cycles...
             if (!object[property].Window
                 && !(object[property] instanceof Node)
                 && !(object[property] instanceof MimeTypeArray)
                 && !(object[property] instanceof PluginArray)) {
                 collectPropertiesHelper(object[property], path);
             }
         } else if (type == "string") {
             emitExpectedResult(path, "''");
         } else if (type == "number") {
             emitExpectedResult(path, "0");
         } else if (type == "boolean") {
             emitExpectedResult(path, "false");
         }
         path.pop();
     }
 }
-