Roll IDLs forward.

third_party/WebCore/workers/WorkerContext.idl

Index: third_party/WebCore/workers/WorkerContext.idl
diff --git a/third_party/WebCore/workers/WorkerContext.idl b/third_party/WebCore/workers/WorkerContext.idl
index 1ff5e910b8085425149e313500df1b61c6254566..69b11f1acab3a665ee4e987a57664bff9eb06775 100644
--- a/third_party/WebCore/workers/WorkerContext.idl
+++ b/third_party/WebCore/workers/WorkerContext.idl
@@ -39,15 +39,15 @@
 
     // WorkerGlobalScope
 #if defined(LANGUAGE_JAVASCRIPT) && LANGUAGE_JAVASCRIPT
-             attribute [Replaceable] WorkerContext self;
+             [Replaceable] readonly attribute  WorkerContext self;
 #endif
-             attribute [Replaceable] WorkerLocation location;
+             [Replaceable] readonly attribute WorkerLocation location;
     void close();
              attribute EventListener onerror;
 
     // WorkerUtils
     [Custom] void importScripts(/*[Variadic] in DOMString urls */);
-             [Replaceable] attribute WorkerNavigator navigator;
+             [Replaceable] readonly attribute WorkerNavigator navigator;
 
     // Timers
     [Custom] long setTimeout(in TimeoutHandler handler, in long timeout);