Automatically fire AX events on Win based on tree changes

third_party/WebKit/Source/modules/accessibility/AXObject.cpp

 /*
  * Copyright (C) 2008, 2009, 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 369 matching lines @@
     return AccessibleNode::GetPropertyOrARIAAttribute(element, property);
   return g_null_atom;
 }
 
 Element* AXObject::GetAOMPropertyOrARIAAttribute(
     AOMRelationProperty property) const {
   Element* element = this->GetElement();
   if (!element)
     return nullptr;
 
-  AccessibleNode* target =
-      AccessibleNode::GetPropertyOrARIAAttribute(element, property);
-  return target ? target->element() : nullptr;
+  return AccessibleNode::GetPropertyOrARIAAttribute(element, property);
 }
 
 bool AXObject::HasAOMProperty(AOMRelationListProperty property,
                               HeapVector<Member<Element>>& result) const {
   Element* element = this->GetElement();
   if (!element)
     return false;
 
   return AccessibleNode::GetProperty(element, property, result);
 }
@@ skipping 1823 matching lines @@
 }
 
 DEFINE_TRACE(AXObject) {
   visitor->Trace(children_);
   visitor->Trace(parent_);
   visitor->Trace(cached_live_region_root_);
   visitor->Trace(ax_object_cache_);
 }
 
 }  // namespace blink