use RUST_JSID_IS_STRING in if condition.

components/script/dom/bindings/codegen/CodegenRust.py

@@ -4750,8 +4750,7 @@ def __init__(self, descriptor, name):
     def define(self):
         # Our first argument is the id we're getting.
         argName = self.arguments[0].identifier.name
-        return ("println!(\"===DEBUG-o-o-o-7 {:?}\", jsid_to_string(cx, id) );\n"
-                "if jsid_to_string(cx, id).is_none() {\n"
+        return ("if !RUST_JSID_IS_STRING(id) {\n"
                 "    return false\n"
                 "}\n"
                 "let %s = string_jsid_to_string(cx, id);\n"

components/script/dom/bindings/conversions.rs

@@ -141,8 +141,6 @@ impl <T: FromJSValConvertible + JSTraceable> FromJSValConvertible for RootedTrac
 /// Panics if `id` is not string-valued.
 pub fn string_jsid_to_string(cx: *mut JSContext, id: HandleId) -> DOMString {
     unsafe {
-        println!("===DEBUG-o-o-o-1 {:?}", jsid_to_string(cx, id) );
-        println!("===DEBUG-o-o-o-2 {:?}", jsid_to_string(cx, id).is_some() );
         assert!(RUST_JSID_IS_STRING(id));
         jsstring_to_str(cx, RUST_JSID_TO_STRING(id))
     }