Bug 1528286. Remove bogus comment. r=froydnj

There are no relocations needed for string constants.

Differential Revision: https://phabricator.services.mozilla.com/D19956

--HG--
extra : moz-landing-system : lando

dom/bindings/Codegen.py

@@ -1862,8 +1862,6 @@ class CGClassConstructor(CGAbstractStaticMethod):
             JS::Rooted<JSObject*> obj(cx, &args.callee());
             $*{chromeOnlyCheck}
             if (!args.isConstructing()) {
-              // XXXbz wish I could get the name from the callee instead of
-              // Adding more relocations
               return ThrowConstructorWithoutNew(cx, "${ctorName}");
             }