Don't ignore landmark and related AXObjects, because they should be exposed to

Source/core/accessibility/AXObject.h

 /*
  * Copyright (C) 2008, 2009, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nuanti Ltd.
  *
  * 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.
@@ skipping 304 matching lines @@
     bool isColorWell() const { return roleValue() == ColorWellRole; }
     bool isComboBox() const { return roleValue() == ComboBoxRole; }
     virtual bool isControl() const { return false; }
     virtual bool isDataTable() const { return false; }
     virtual bool isFieldset() const { return false; }
     virtual bool isFileUploadButton() const { return false; }
     virtual bool isHeading() const { return false; }
     virtual bool isImage() const { return false; }
     virtual bool isImageMapLink() const { return false; }
     virtual bool isInputImage() const { return false; }
+    bool isLandmarkRelated() const;
     virtual bool isLink() const { return false; }
     virtual bool isList() const { return false; }
     bool isListItem() const { return roleValue() == ListItemRole; }
     virtual bool isListBoxOption() const { return false; }
     virtual bool isMenu() const { return false; }
     virtual bool isMenuButton() const { return false; }
     virtual bool isMenuList() const { return false; }
     virtual bool isMenuListOption() const { return false; }
     virtual bool isMenuListPopup() const { return false; }
     bool isMenuRelated() const;
@@ skipping 240 matching lines @@
 
     bool m_detached;
 };
 
 #define DEFINE_AX_OBJECT_TYPE_CASTS(thisType, predicate) \
     DEFINE_TYPE_CASTS(thisType, AXObject, object, object->predicate, object.predicate)
 
 } // namespace WebCore
 
 #endif // AXObject_h