Add live region root to the cached properties of an AXObject.

Source/core/accessibility/AXRenderObject.h

 /*
  * Copyright (C) 2008 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 108 matching lines @@
     virtual bool ariaHasPopup() const override;
     virtual bool ariaRoleHasPresentationalChildren() const override;
     virtual bool isPresentationalChildOfAriaRole() const override;
     virtual bool shouldFocusActiveDescendant() const override;
     virtual bool supportsARIADragging() const override;
     virtual bool supportsARIADropping() const override;
     virtual bool supportsARIAFlowTo() const override;
     virtual bool supportsARIAOwns() const override;
 
     // ARIA live-region features.
-    virtual const AtomicString& ariaLiveRegionStatus() const override;
-    virtual const AtomicString& ariaLiveRegionRelevant() const override;
-    virtual bool ariaLiveRegionAtomic() const override;
-    virtual bool ariaLiveRegionBusy() const override;
+    virtual const AtomicString& liveRegionStatus() const override;
+    virtual const AtomicString& liveRegionRelevant() const override;
+    virtual bool liveRegionAtomic() const override;
+    virtual bool liveRegionBusy() const override;
 
     // Accessibility Text.
     virtual String textUnderElement() const override;
 
     // Accessibility Text - (To be deprecated).
     virtual String helpText() const override;
 
     // Location and click point in frame-relative coordinates.
     virtual void markCachedElementRectDirty() const override;
     virtual IntPoint clickPoint() override;
@@ skipping 76 matching lines @@
     VisibleSelection selection() const;
     int indexForVisiblePosition(const VisiblePosition&) const;
     void accessibilityChildrenFromAttribute(QualifiedName attr, AccessibilityChildrenVector&) const;
 };
 
 DEFINE_AX_OBJECT_TYPE_CASTS(AXRenderObject, isAXRenderObject());
 
 } // namespace blink
 
 #endif // AXRenderObject_h