[proxies] Fix HasProperty and getOwnPropertySymbols

test/mjsunit/harmony/proxies-define-property.js

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Flags: --harmony-proxies
 
 // Check basic call to trap.
 
 var g_target, g_name, g_desc;
 var handler = {
@@ skipping 32 matching lines @@
 Object.defineProperty(proxy, 0, desc);
 assertTrue(typeof g_name === "string");
 assertEquals("0", g_name);
 
 // Step 10: Trap returns false.
 handler.defineProperty = function(t, n, d) { return false; }
 assertThrows("Object.defineProperty(proxy, 'foo', desc)", TypeError);
 
 // Step 15a: Trap returns true for adding a property to a non-extensible target.
 handler.defineProperty = function(t, n, d) { return true; }
-Object.freeze(target);
+Object.preventExtensions(target);
 assertThrows("Object.defineProperty(proxy, 'foo', desc)", TypeError);
 
 // Step 15b: Trap returns true for adding a non-configurable property.
 target = {};
 proxy = new Proxy(target, handler);
 desc = {value: 1, writable: true, configurable: false, enumerable: true};
 assertThrows("Object.defineProperty(proxy, 'foo', desc)", TypeError);
 // No exception is thrown if a non-configurable property exists on the target.
 Object.defineProperty(target, "nonconf",
                       {value: 1, writable: true, configurable: false});
 Object.defineProperty(proxy, "nonconf", {value: 2, configurable: false});
 
 // Step 16a: Trap returns true for non-compatible property descriptor.
 Object.defineProperty(target, "foo",
                       {value: 1, writable: false, configurable: false});
 assertThrows("Object.defineProperty(proxy, 'foo', {value: 2})", TypeError);
 
 // Step 16b: Trap returns true for overwriting a configurable property
 // with a non-configurable descriptor.
 target.bar = "baz";
 assertThrows("Object.defineProperty(proxy, 'bar', {configurable: false})",
              TypeError);