[tests] Fix bogus uses of assertThrows.

test/mjsunit/harmony/proxies-for.js

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 97 matching lines @@
 
 // Throw exception in enumerate trap.
 
 function TestForInThrow(handler) {
   TestWithProxies(TestForInThrow2, handler)
 }
 
 function TestForInThrow2(create, handler) {
   var p = create(handler)
   var o = Object.create(p)
-  assertThrows(function(){ for (var x in p) {} }, "myexn")
-  assertThrows(function(){ for (var x in o) {} }, "myexn")
+  assertThrowsEquals(function(){ for (var x in p) {} }, "myexn")
+  assertThrowsEquals(function(){ for (var x in o) {} }, "myexn")
 }
 
 TestForInThrow({
   enumerate: function() { throw "myexn" }
 })
 
 TestForInThrow({
   enumerate: function() { return this.enumerate2() },
   enumerate2: function() { throw "myexn" }
 })
@@ skipping 10 matching lines @@
   o.__proto__ = p;
   var keys = [];
   for (var k in o) { keys.push(k); };
   assertEquals(["0"], keys);
 })();
 
 (function () {
   var p = new Proxy({}, {ownKeys: function() { return ["1", Symbol(), "2"] }});
   assertEquals(["1","2"], Object.getOwnPropertyNames(p));
 })();