Bug 1426525 part 5. Remove the 'ref' getter/setter on XULElement. r=smaug

The WebIDL for this was already removed in bug 1425356.

MozReview-Commit-ID: HWxPe3a0Pmi

dom/base/nsGkAtomList.h

@@ -1159,7 +1159,6 @@ GK_ATOM(range, "range")
 GK_ATOM(readonly, "readonly")
 GK_ATOM(rect, "rect")
 GK_ATOM(rectangle, "rectangle")
-GK_ATOM(ref, "ref")
 GK_ATOM(refresh, "refresh")
 GK_ATOM(rel, "rel")
 GK_ATOM(onreloadpage, "onreloadpage")

dom/xul/nsXULElement.h

@@ -623,14 +623,6 @@ public:
     {
         SetXULAttr(nsGkAtoms::top, aValue, rv);
     }
-    void GetRef(DOMString& aValue) const
-    {
-        GetXULAttr(nsGkAtoms::ref, aValue);
-    }
-    void SetRef(const nsAString& aValue, mozilla::ErrorResult& rv)
-    {
-        SetXULAttr(nsGkAtoms::ref, aValue, rv);
-    }
     void GetTooltipText(DOMString& aValue) const
     {
         GetXULAttr(nsGkAtoms::tooltiptext, aValue);