wakelock errors should have error messages

[jdm]

Each use of Error::NotAllowed(None) in

servo/components/script/dom/wakelock/wakelock.rs

Line 47 in 77458b2

fn Request(&self, cx: &mut CurrentRealm, _type_: WakeLockType) -> Rc<Promise> {

and

servo/components/script/dom/wakelock/wakelock.rs

Line 88 in 77458b2

promise.reject_error(Error::NotAllowed(None), can_gc);

should pass a Some("Some descriptive error message".to_string()") insread.

[TG199]

@servo-highfive assign me

[servo-highfive]

Hey @TG199! Thanks for your interest in working on this issue. It's now assigned to you!