Skip 'accessibilityController' property in the cached properties test

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

Index: LayoutTests/fast/dom/Window/resources/window-property-collector.js
diff --git a/LayoutTests/fast/dom/Window/resources/window-property-collector.js b/LayoutTests/fast/dom/Window/resources/window-property-collector.js
index 3b07a4e1220fa525e4b25ad4b6380695aa31c0c0..42f915549be90be1a19c9f22ede6d51ec8d844e8 100644
--- a/LayoutTests/fast/dom/Window/resources/window-property-collector.js
+++ b/LayoutTests/fast/dom/Window/resources/window-property-collector.js
@@ -62,7 +62,13 @@ 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);
@@ -85,4 +91,3 @@ function collectPropertiesHelper(object, path)
         path.pop();
     }
 }
-