Issue #252 - Move getElementsByName from HTMLDocument to Document

Based on https://bugzilla.mozilla.org/show_bug.cgi?id=1415176

dom/html/nsHTMLDocument.cpp

@@ -1810,33 +1810,6 @@ nsHTMLDocument::Writeln(JSContext* cx, const Sequence<nsString>& aText,
   WriteCommon(cx, aText, true, rv);
 }
 
-bool
-nsHTMLDocument::MatchNameAttribute(Element* aElement, int32_t aNamespaceID,
-                                   nsIAtom* aAtom, void* aData)
-{
-  NS_PRECONDITION(aElement, "Must have element to work with!");
-  nsString* elementName = static_cast<nsString*>(aData);
-  return
-    aElement->GetNameSpaceID() == kNameSpaceID_XHTML &&
-    aElement->AttrValueIs(kNameSpaceID_None, nsGkAtoms::name,
-                          *elementName, eCaseMatters);
-}
-
-/* static */
-void*
-nsHTMLDocument::UseExistingNameString(nsINode* aRootNode, const nsString* aName)
-{
-  return const_cast<nsString*>(aName);
-}
-
-NS_IMETHODIMP
-nsHTMLDocument::GetElementsByName(const nsAString& aElementName,
-                                  nsIDOMNodeList** aReturn)
-{
-  *aReturn = GetElementsByName(aElementName).take();
-  return NS_OK;
-}
-
 void
 nsHTMLDocument::AddedForm()
 {