Cleanup <static_cast>: Switch to toFoo for Accessibility Objects.

Source/core/accessibility/AccessibilityARIAGrid.cpp

 /*
  * Copyright (C) 2009 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 39 matching lines @@
 PassRefPtr<AccessibilityARIAGrid> AccessibilityARIAGrid::create(RenderObject* renderer)
 {
     return adoptRef(new AccessibilityARIAGrid(renderer));
 }
 
 bool AccessibilityARIAGrid::addTableCellChild(AccessibilityObject* child, HashSet<AccessibilityObject*>& appendedRows, unsigned& columnCount)
 {
     if (!child || !child->isTableRow() || child->ariaRoleAttribute() != RowRole)
         return false;
 
-    AccessibilityTableRow* row = static_cast<AccessibilityTableRow*>(child);
+    AccessibilityTableRow* row = toAccessibilityTableRow(child);
     if (appendedRows.contains(row))
         return false;
 
     // store the maximum number of columns
     unsigned rowCellCount = row->children().size();
     if (rowCellCount > columnCount)
         columnCount = rowCellCount;
 
     row->setRowIndex((int)m_rows.size());
     m_rows.append(row);
@@ skipping 39 matching lines @@
             // This allows the table to dive arbitrarily deep to find the rows.
             AccessibilityChildrenVector children = child->children();
             size_t length = children.size();
             for (size_t i = 0; i < length; ++i)
                 addTableCellChild(children[i].get(), appendedRows, columnCount);
         }
     }
 
     // make the columns based on the number of columns in the first body
     for (unsigned i = 0; i < columnCount; ++i) {
-        AccessibilityTableColumn* column = static_cast<AccessibilityTableColumn*>(axCache->getOrCreate(ColumnRole));
+        AccessibilityTableColumn* column = toAccessibilityTableColumn(axCache->getOrCreate(ColumnRole));
         column->setColumnIndex((int)i);
         column->setParent(this);
         m_columns.append(column);
         if (!column->accessibilityIsIgnored())
             m_children.append(column);
     }
 
     AccessibilityObject* headerContainerObject = headerContainer();
     if (headerContainerObject && !headerContainerObject->accessibilityIsIgnored())
         m_children.append(headerContainerObject);
 }
 
 } // namespace WebCore