Count element name validity per DOM versus HTML parsing.

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

Index: third_party/WebKit/Source/core/dom/DOMImplementation.idl
diff --git a/third_party/WebKit/Source/core/dom/DOMImplementation.idl b/third_party/WebKit/Source/core/dom/DOMImplementation.idl
index cd19db55df622f3f4a3a8b7c9c6959534ba1fb3d..a7c41a13a6e07322a849ab35a861adf9bde2c21a 100644
--- a/third_party/WebKit/Source/core/dom/DOMImplementation.idl
+++ b/third_party/WebKit/Source/core/dom/DOMImplementation.idl
@@ -24,7 +24,8 @@
     DependentLifetime,
 ] interface DOMImplementation {
     [NewObject, RaisesException] DocumentType createDocumentType(DOMString qualifiedName, DOMString publicId, DOMString systemId);
-    [NewObject, RaisesException] XMLDocument createDocument(DOMString? namespaceURI, [TreatNullAs=EmptyString] DOMString qualifiedName, optional DocumentType? doctype = null);
+    // TODO(dominicc): Remove CallWith= when crbug/648179 is fixed.
+    [CallWith=EnteredWindow, NewObject, RaisesException] XMLDocument createDocument(DOMString? namespaceURI, [TreatNullAs=EmptyString] DOMString qualifiedName, optional DocumentType? doctype = null);
     // FIXME: createHTMLDocument should return a Document. crbug.com/238368
     // FIXME: The title argument should not have a default value. crbug.com/335871
     [NewObject] HTMLDocument createHTMLDocument(optional DOMString title = null);