ported from UXP: Bug 1422197 - Add fast path to get DocGroup in binding code for [CEReactions] (ca09afd0)

dom/html/HTMLOptionsCollection.h

@@ -23,6 +23,7 @@ class nsIDOMHTMLOptionElement;
 namespace mozilla {
 namespace dom {
 
+class DocGroup;
 class HTMLElementOrLong;
 class HTMLOptionElementOrHTMLOptGroupElement;
 class HTMLSelectElement;
@@ -62,6 +63,7 @@ public:
 
   virtual Element* GetElementAt(uint32_t aIndex) override;
   virtual nsINode* GetParentObject() override;
+  DocGroup* GetDocGroup() const;
 
   NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_AMBIGUOUS(HTMLOptionsCollection,
                                                          nsIHTMLCollection)