Rewrite HTMLOptionsCollection to extend HTMLCollection

Author: ghostbuster91

src/main/scala/org/scalajs/dom/HTMLCollection.scala

@@ -14,7 +14,7 @@ import scala.scalajs.js.annotation._
   */
 @js.native
 @JSGlobal
-class HTMLCollection private[this] () extends DOMList[Element] {
+abstract class HTMLCollection extends DOMList[Element] {
   def item(index: Int): Element = js.native
 
   /** Returns the specific node whose ID or, as a fallback, name matches the string specified by name. Matching by name

src/main/scala/org/scalajs/dom/HTMLOptionsCollection.scala

@@ -15,12 +15,12 @@ import scala.scalajs.js.annotation._
   */
 @js.native
 @JSGlobal
-class HTMLOptionsCollection private[this] () extends DOMList[HTMLOptionElement] {
-  def item(index: Int): HTMLOptionElement = js.native
+class HTMLOptionsCollection private[this] () extends HTMLCollection {
+  override def item(index: Int): HTMLOptionElement = js.native
 
   /** Returns the specific node whose ID or, as a fallback, name matches the string specified by name. Matching by name
     * is only done as a last resort, only in HTML, and only if the referenced element supports the name attribute.
     * Returns null if no node exists by the given name.
     */
-  def namedItem(name: String): HTMLOptionElement = js.native
+  override def namedItem(name: String): HTMLOptionElement = js.native
 }