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

Source/core/accessibility/AccessibilityImageMapLink.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 57 matching lines @@
 private:
     RefPtr<HTMLAreaElement> m_areaElement;
     RefPtr<HTMLMapElement> m_mapElement;
 
     virtual void detachFromParent() OVERRIDE;
 
     virtual void accessibilityText(Vector<AccessibilityText>&) OVERRIDE;
     virtual bool isImageMapLink() const OVERRIDE { return true; }
 };
 
+inline AccessibilityImageMapLink* toAccessibilityImageMapLink(AccessibilityObject* object)
+{
+    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isImageMapLink());
+    return static_cast<AccessibilityImageMapLink*>(object);
+}
+
+inline const AccessibilityImageMapLink* toAccessibilityImageMapLink(const AccessibilityObject* object)
+{
+    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isImageMapLink());
+    return static_cast<const AccessibilityImageMapLink*>(object);
+}
+
+// This will catch anyone doing an unnecessary cast.
+void toAccessibilityImageMapLink(const AccessibilityImageMapLink*);
+
 } // namespace WebCore
 
 #endif // AccessibilityImageMapLink_h