Bug 865615 - Remove Accessible::DOMNode. r=surkov

Replace Accessible::DOMNode with Accessible::GetNode version

--HG--
extra : rebase_source : c8b2480e3ec521afbc3979d6932b6876c85796b5

accessible/generic/Accessible.h

@@ -166,11 +166,7 @@ public:
    * Return DOM node associated with the accessible.
    */
   virtual nsINode* GetNode() const;
-  inline already_AddRefed<nsIDOMNode> DOMNode() const
-  {
-    nsCOMPtr<nsIDOMNode> DOMNode = do_QueryInterface(GetNode());
-    return DOMNode.forget();
-  }
+
   nsIContent* GetContent() const { return mContent; }
   mozilla::dom::Element* Elm() const
     { return mContent && mContent->IsElement() ? mContent->AsElement() : nullptr; }

accessible/xul/XULTabAccessible.cpp

@@ -114,7 +114,7 @@ XULTabAccessible::RelationByType(RelationType aType)
   if (!tabsElm)
     return rel;
 
-  nsCOMPtr<nsIDOMNode> domNode(DOMNode());
+  nsCOMPtr<nsIDOMNode> domNode(do_QueryInterface(GetNode()));
   nsCOMPtr<nsIDOMNode> tabpanelNode;
   tabsElm->GetRelatedElement(domNode, getter_AddRefs(tabpanelNode));
   if (!tabpanelNode)
@@ -201,7 +201,7 @@ XULTabpanelAccessible::RelationByType(RelationType aType)
   if (!tabpanelsElm)
     return rel;
 
-  nsCOMPtr<nsIDOMNode> domNode(DOMNode());
+  nsCOMPtr<nsIDOMNode> domNode(do_QueryInterface(GetNode()));
   nsCOMPtr<nsIDOMNode> tabNode;
   tabpanelsElm->GetRelatedElement(domNode, getter_AddRefs(tabNode));
   if (!tabNode)