Correctly mark functions from our natives files during compilation.

src/messages.js

Index: src/messages.js
diff --git a/src/messages.js b/src/messages.js
index b9281070a7670f6d38b1e7e5ddea603d551e9cc2..75ecddc096ed7db39e429e927dfc8001bdc7efef 100644
--- a/src/messages.js
+++ b/src/messages.js
@@ -1050,13 +1050,15 @@ function captureStackTrace(obj, cons_opt) {
 
 $Math.__proto__ = global.Object.prototype;
 
-DefineError(function Error() { });
-DefineError(function TypeError() { });
-DefineError(function RangeError() { });
-DefineError(function SyntaxError() { });
-DefineError(function ReferenceError() { });
-DefineError(function EvalError() { });
-DefineError(function URIError() { });
+// DefineError is a native function. Use explicit receiver. Otherwise
+// the receiver will be 'undefined'.
+this.DefineError(function Error() { });
+this.DefineError(function TypeError() { });
+this.DefineError(function RangeError() { });
+this.DefineError(function SyntaxError() { });
+this.DefineError(function ReferenceError() { });
+this.DefineError(function EvalError() { });
+this.DefineError(function URIError() { });
 
 $Error.captureStackTrace = captureStackTrace;