Remove 'type' and 'arguments' properties from Error object.

test/mjsunit/regress/regress-1980.js

Index: test/mjsunit/regress/regress-1980.js
diff --git a/test/mjsunit/regress/regress-1980.js b/test/mjsunit/regress/regress-1980.js
index 49dfd063bae26bd704b44024878d12ac28d62f1f..d87ff45074576a9bbe988a20a22c9edc70590214 100644
--- a/test/mjsunit/regress/regress-1980.js
+++ b/test/mjsunit/regress/regress-1980.js
@@ -34,7 +34,7 @@ for (var i = 0; i < invalid_this.length; i++) {
     Error.prototype.toString.call(invalid_this[i]);
   } catch (e) {
     exception = true;
-    assertTrue("called_on_non_object" == e.type);
+    assertEquals("Error.prototype.toString called on non-object", e.message);
   }
   assertTrue(exception);
 }