Expose WorkerNavigator interface to web workers

Source/core/page/WorkerNavigator.idl

 /*
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 [
-    NoInterfaceObject
+    GlobalContext=WorkerGlobalScope
 ] interface WorkerNavigator {
     readonly attribute DOMString appName;
     readonly attribute DOMString appVersion;
     readonly attribute DOMString platform;
     readonly attribute DOMString userAgent;
 
     readonly attribute boolean onLine;
 };