Adjust key behaviour for weak collections

test/mjsunit/harmony/private.js

 // Copyright 2013 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 178 matching lines @@
     symbols[i][62] = 0
     assertEquals(undefined, symbols[i][62])
   }
 }
 TestSet()
 
 
 function TestCollections() {
   var set = new Set
   var map = new Map
-  var weakmap = new WeakMap
   for (var i in symbols) {
     set.add(symbols[i])
     map.set(symbols[i], i)
-    weakmap.set(symbols[i], i)
   }
   assertEquals(symbols.length, set.size)
   assertEquals(symbols.length, map.size)
   for (var i in symbols) {
     assertTrue(set.has(symbols[i]))
     assertTrue(map.has(symbols[i]))
-    assertTrue(weakmap.has(symbols[i]))
     assertEquals(i, map.get(symbols[i]))
-    assertEquals(i, weakmap.get(symbols[i]))
   }
   for (var i in symbols) {
     assertTrue(set.delete(symbols[i]))
     assertTrue(map.delete(symbols[i]))
-    assertTrue(weakmap.delete(symbols[i]))
   }
   assertEquals(0, set.size)
   assertEquals(0, map.size)
 }
 TestCollections()
 
 
 
 function TestKeySet(obj) {
   assertTrue(%HasFastProperties(obj))
@@ skipping 122 matching lines @@
   obj[sym] = 1
   freeze(obj)
   obj[sym] = 2
   assertEquals(2, obj[sym])
   assertTrue(delete obj[sym])
   assertEquals(undefined, obj[sym])
 }
 TestSealAndFreeze(Object.seal)
 TestSealAndFreeze(Object.freeze)
 TestSealAndFreeze(Object.preventExtensions)