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

Source/core/accessibility/AccessibilityTableCell.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 42 matching lines @@
     int m_rowIndex;
     virtual AccessibilityRole determineAccessibilityRole() OVERRIDE;
 
 private:
     // If a table cell is not exposed as a table cell, a TH element can serve as its title UI element.
     virtual AccessibilityObject* titleUIElement() const OVERRIDE;
     virtual bool exposesTitleUIElement() const OVERRIDE { return true; }
     virtual bool computeAccessibilityIsIgnored() const OVERRIDE;
 };
 
+inline AccessibilityTableCell* toAccessibilityTableCell(AccessibilityObject* object)
+{
+    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isTableCell());
+    return static_cast<AccessibilityTableCell*>(object);
+}
+
+inline const AccessibilityTableCell* toAccessibilityTableCell(const AccessibilityObject* object)
+{
+    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isTableCell());
+    return static_cast<const AccessibilityTableCell*>(object);
+}
+
+// This will catch anyone doing an unnecessary cast.
+void toAccessibilityTableCell(const AccessibilityTableCell*);
+
 } // namespace WebCore
 
 #endif // AccessibilityTableCell_h