Bug 851891. Make stringifier attributes fail to codegen. r=khuey

dom/bindings/Codegen.py

@@ -8689,6 +8689,10 @@ class CGDescriptor(CGThing):
                     else:
                         hasMethod = True
             elif m.isAttr():
+                if m.stringifier:
+                    raise TypeError("Stringifier attributes not supported yet. "
+                                    "See bug 824857.\n"
+                                    "%s" % m.location);
                 if m.isStatic():
                     assert descriptor.interface.hasInterfaceObject
                     cgThings.append(CGStaticGetter(descriptor, m))

dom/webidl/URLUtils.webidl

@@ -16,7 +16,9 @@
 [NoInterfaceObject]
 interface URLUtils {
   [SetterThrows]
-  stringifier attribute DOMString href;
+  // Bug 824857: no support for stringifier attributes yet.
+  //  stringifier attribute DOMString href;
+           attribute DOMString href;
   readonly attribute DOMString origin;
 
            attribute DOMString protocol;