Get rid of postToElement argument for accessibility notifications.

Source/modules/accessibility/AXTableRow.cpp

 /*
  * 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 54 matching lines @@
 
 bool AXTableRow::isTableRow() const
 {
     AXObject* table = parentTable();
     if (!table || !table->isAXTable())
         return false;
 
     return true;
 }
 
-AXObject* AXTableRow::observableObject() const
-{
-    // This allows the table to be the one who sends notifications about tables.
-    return parentTable();
-}
-
 bool AXTableRow::computeAccessibilityIsIgnored() const
 {
     AXObjectInclusion decision = defaultObjectInclusion();
     if (decision == IncludeObject)
         return false;
     if (decision == IgnoreObject)
         return true;
 
     if (!isTableRow())
         return AXLayoutObject::computeAccessibilityIsIgnored();
@@ skipping 28 matching lines @@
     for (const auto& cell : children()) {
         if (!cell->isTableCell())
             continue;
 
         if (toAXTableCell(cell.get())->scanToDecideHeaderRole() == RowHeaderRole)
             headers.append(cell);
     }
 }
 
 } // namespace blink