Bug 1316347 - Only expose the HTMLShadowElement and HTMLContentElement interfaces when web components are enabled. r=smaug

dom/webidl/HTMLContentElement.webidl

@@ -11,6 +11,7 @@
  * and create derivative works of this document.
  */
 
+[Func="nsDocument::IsWebComponentsEnabled"]
 interface HTMLContentElement : HTMLElement
 {
   attribute DOMString select;

dom/webidl/HTMLShadowElement.webidl

@@ -11,6 +11,7 @@
  * and create derivative works of this document.
  */
 
+[Func="nsDocument::IsWebComponentsEnabled"]
 interface HTMLShadowElement : HTMLElement
 {
   readonly attribute ShadowRoot? olderShadowRoot;