Implement immutable prototype chains

test/mjsunit/es6/proxies-global-reference.js

Index: test/mjsunit/es6/proxies-global-reference.js
diff --git a/test/mjsunit/es6/proxies-global-reference.js b/test/mjsunit/es6/proxies-global-reference.js
index 975d7f75fb27a87a719277ba386d192a103bfa36..1e3d3beb8658bb1e9d009f20a1919dd7dc958e79 100644
--- a/test/mjsunit/es6/proxies-global-reference.js
+++ b/test/mjsunit/es6/proxies-global-reference.js
@@ -5,8 +5,5 @@
 var failing_proxy = new Proxy({}, new Proxy({}, {
   get() { throw "No trap should fire" }}));
 
-Object.setPrototypeOf(Object.prototype, failing_proxy);
-assertThrows(()=>a, TypeError);
-
-Object.setPrototypeOf(this, failing_proxy);
-assertThrows(()=>a, TypeError);
+assertThrows(() => Object.setPrototypeOf(Object.prototype, failing_proxy), TypeError);
+assertThrows(()=>a, ReferenceError);

[Dan Ehrenberg, 2016/06/29 18:04:01]

The loss of this test is a bit unfortunate, but it could be reconstituted with a
cctest which constructs the right sort of global object and manipulates its
proto chain. However, that test will soon be obsolete when the code path is
removed after making Blink's prototype chain immutable per spec.