Bug 1182214 - Follow-up to fix Presentation.displayedAccessibles getter. r=me CLOSED TREE

accessible/jsat/Presentation.jsm

@@ -691,6 +691,7 @@ this.Presentation = { // jshint ignore:line
   get displayedAccessibles() {
     delete this.displayedAccessibles;
     this.displayedAccessibles = new WeakMap();
+    return this.displayedAccessibles;
   },
 
   pivotChanged: function Presentation_pivotChanged(