Use union types for HTMLSelectElement.add()'s arguments

Source/core/html/HTMLOptionsCollection.cpp

 /*
  * Copyright (C) 2006, 2011, 2012 Apple Computer, Inc.
  * Copyright (C) 2014 Samsung Electronics. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 51 matching lines @@
                 names.append(nameAttribute);
         }
     }
 }
 
 PassRefPtrWillBeRawPtr<HTMLOptionsCollection> HTMLOptionsCollection::create(ContainerNode& select, CollectionType)
 {
     return adoptRefWillBeNoop(new HTMLOptionsCollection(select));
 }
 
-void HTMLOptionsCollection::add(PassRefPtrWillBeRawPtr<HTMLOptionElement> element, ExceptionState& exceptionState)
+void HTMLOptionsCollection::add(const HTMLOptionElementOrHTMLOptGroupElement& element, const HTMLElementOrLong& before, ExceptionState& exceptionState)
 {
-    add(element, length(), exceptionState);
-}
-
-void HTMLOptionsCollection::add(PassRefPtrWillBeRawPtr<HTMLOptionElement> element, int index, ExceptionState& exceptionState)
-{
-    HTMLOptionElement* newOption = element.get();
-
-    if (!newOption) {
-        exceptionState.throwTypeError("The element provided was not an HTMLOptionElement.");
-        return;
-    }
-
-    if (index < -1) {
-        exceptionState.throwDOMException(IndexSizeError, "The index provided (" + String::number(index) + ") is less than -1.");
-        return;
-    }
-
-    HTMLSelectElement& select = toHTMLSelectElement(ownerNode());
-
-    if (index == -1 || unsigned(index) >= length())
-        select.add(newOption, 0, exceptionState);
-    else
-        select.addBeforeOptionAtIndex(newOption, index, exceptionState);
-
-    ASSERT(!exceptionState.hadException());
+    toHTMLSelectElement(ownerNode()).add(element, before, exceptionState);
 }
 
 void HTMLOptionsCollection::remove(int index)
 {
     toHTMLSelectElement(ownerNode()).remove(index);
 }
 
 int HTMLOptionsCollection::selectedIndex() const
 {
     return toHTMLSelectElement(ownerNode()).selectedIndex();
@@ skipping 32 matching lines @@
     if (!value) { // undefined or null
         base.remove(index);
         return true;
     }
     base.setOption(index, value.get(), exceptionState);
     return true;
 }
 
 } //namespace