Update IDL to 1847

core/css/FontFaceSet.idl

Index: core/css/FontFaceSet.idl
diff --git a/core/css/FontFaceSet.idl b/core/css/FontFaceSet.idl
index 643c335b562458e8ebea329064a7ef0cb6c0f0c5..7f5b6ced0be962467e4aa543e821c4c99e2e6dd3 100644
--- a/core/css/FontFaceSet.idl
+++ b/core/css/FontFaceSet.idl
@@ -32,7 +32,7 @@ enum FontFaceSetLoadStatus { "loading", "loaded" };
 
 [
     ActiveDOMObject,
-    GenerateVisitDOMWrapper=document,
+    SetWrapperReferenceFrom=document,
     NoInterfaceObject,
     RuntimeEnabled=FontLoadEvents,
 ] interface FontFaceSet : EventTarget {
@@ -41,10 +41,16 @@ enum FontFaceSetLoadStatus { "loading", "loaded" };
     attribute EventHandler onloadingdone;
     attribute EventHandler onloadingerror;
 
-    [RaisesException] sequence<FontFace> match(DOMString font, [Default=NullString] optional DOMString text);
     [RaisesException] boolean check(DOMString font, [Default=NullString] optional DOMString text);
     [RaisesException] Promise load(DOMString font, [Default=NullString] optional DOMString text);
     Promise ready();
 
+    [RaisesException] void add(FontFace fontFace);
+    void clear();
+    [RaisesException, ImplementedAs=remove] boolean delete(FontFace fontFace);
+    void forEach(FontFaceSetForEachCallback callback, optional any thisArg);
+    [RaisesException] boolean has(FontFace fontFace);
+
+    readonly attribute unsigned long size;
     readonly attribute FontFaceSetLoadStatus status;
 };