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

Source/core/html/HTMLOptionsCollection.cpp

Index: Source/core/html/HTMLOptionsCollection.cpp
diff --git a/Source/core/html/HTMLOptionsCollection.cpp b/Source/core/html/HTMLOptionsCollection.cpp
index 672737edffb5a535c6d092e3af26952a507d9a1a..3899f43ad62a06d3571591977bc65c9f4f5a7ff9 100644
--- a/Source/core/html/HTMLOptionsCollection.cpp
+++ b/Source/core/html/HTMLOptionsCollection.cpp
@@ -69,33 +69,9 @@ PassRefPtrWillBeRawPtr<HTMLOptionsCollection> HTMLOptionsCollection::create(Cont
     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)