Support Document constructor.

third_party/WebKit/Source/core/dom/Document.idl

Index: third_party/WebKit/Source/core/dom/Document.idl
diff --git a/third_party/WebKit/Source/core/dom/Document.idl b/third_party/WebKit/Source/core/dom/Document.idl
index bc6a55fa0e2bac0d8b016d668d6e7f7071004230..39e49dbbc4c616f4856ba5456e0e4789ac83ac60 100644
--- a/third_party/WebKit/Source/core/dom/Document.idl
+++ b/third_party/WebKit/Source/core/dom/Document.idl
@@ -34,8 +34,10 @@ typedef (HTMLScriptElement or SVGScriptElement) HTMLOrSVGScriptElement;
 
 // https://dom.spec.whatwg.org/#interface-document
 
-// FIXME: Document should have a constructor. crbug.com/238234
-interface Document : Node {
+[
+    Constructor(),
+    ConstructorCallWith=Document,
+] interface Document : Node {
     [SameObject] readonly attribute DOMImplementation implementation;
     [ImplementedAs=urlForBinding] readonly attribute DOMString URL;
     // FIXME: documentURI should not be nullable.