Get rid of postToElement argument for accessibility notifications.

Source/modules/accessibility/AXLayoutObject.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 144 matching lines @@
 
     // Low-level accessibility tree exploration, only for use within the accessibility module.
     virtual AXObject* firstChild() const override;
     virtual AXObject* nextSibling() const override;
     virtual void addChildren() override;
     virtual bool canHaveChildren() const override;
     virtual void updateChildrenIfNecessary() override;
     virtual bool needsToUpdateChildren() const override { return m_childrenDirty; }
     virtual void setNeedsToUpdateChildren() override { m_childrenDirty = true; }
     virtual void clearChildren() override;
-    virtual AXObject* observableObject() const override;
 
     // Properties of the object's owning document or page.
     virtual double estimatedLoadingProgress() const override;
 
     // DOM and layout tree access.
     virtual Node* node() const override;
     virtual Document* document() const override;
     virtual FrameView* documentFrameView() const override;
     virtual Element* anchorElement() const override;
     virtual Widget* widgetForAttachmentView() const override;
@@ skipping 16 matching lines @@
     virtual VisiblePosition visiblePositionForIndex(int) const override;
     virtual void lineBreaks(Vector<int>&) const override;
 
 private:
     bool isAllowedChildOfTree() const;
     void ariaListboxSelectedChildren(AccessibilityChildrenVector&);
     PlainTextRange ariaSelectedTextRange() const;
     bool nodeIsTextControl(const Node*) const;
     bool isTabItemSelected() const;
     AXObject* accessibilityImageMapHitTest(HTMLAreaElement*, const IntPoint&) const;
-    bool layoutObjectIsObservable(LayoutObject*) const;
     LayoutObject* layoutParentObject() const;
     bool isDescendantOfElementType(const HTMLQualifiedName& tagName) const;
     bool isSVGImage() const;
     void detachRemoteSVGRoot();
     AXSVGRoot* remoteSVGRootElement() const;
     AXObject* remoteSVGElementHitTest(const IntPoint&) const;
     void offsetBoundingBoxForRemoteSVGElement(LayoutRect&) const;
     void addHiddenChildren();
     void addTextFieldChildren();
     void addImageMapChildren();
@@ skipping 10 matching lines @@
     VisibleSelection selection() const;
     int indexForVisiblePosition(const VisiblePosition&) const;
     void accessibilityChildrenFromAttribute(QualifiedName attr, AccessibilityChildrenVector&) const;
 };
 
 DEFINE_AX_OBJECT_TYPE_CASTS(AXLayoutObject, isAXLayoutObject());
 
 } // namespace blink
 
 #endif // AXLayoutObject_h