Editorial: Don't set [[GlobalEnv]] to undefined temporarily (#3511)

Author: linusg

spec.html

@@ -11786,7 +11786,6 @@ <h1>InitializeHostDefinedRealm ( ): either a normal completion containing ~unuse
         1. Let _realm_ be a new Realm Record.
         1. Perform CreateIntrinsics(_realm_).
         1. Set _realm_.[[AgentSignifier]] to AgentSignifier().
-        1. Set _realm_.[[GlobalEnv]] to *undefined*.
         1. Set _realm_.[[TemplateMap]] to a new empty List.
         1. Let _newContext_ be a new execution context.
         1. Set the Function of _newContext_ to *null*.