Update interfaces/hr-time.idl (#13836)

Source: https://github.com/tidoust/reffy-reports/blob/302154e/whatwg/idl/hr-time.idl
Build: https://travis-ci.org/tidoust/reffy-reports/builds/449201928

Author: autofoolip

interfaces/hr-time.idl

@@ -13,6 +13,5 @@ interface Performance : EventTarget {
 };
 
 partial interface mixin WindowOrWorkerGlobalScope {
-    [Replaceable]
-    readonly    attribute Performance performance;
+  [Replaceable] readonly attribute Performance performance;
 };