ES6 symbols: prevent reflection and proxy APIs from leaking symbols

test/mjsunit/harmony/object-observe.js

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 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --harmony-observation --harmony-proxies --harmony-collections
-// Flags: --allow-natives-syntax
+// Flags: --harmony-symbols --allow-natives-syntax
 
 var allObservers = [];
 function reset() {
   allObservers.forEach(function(observer) { observer.reset(); });
 }
 
 function stringifyNoThrow(arg) {
   try {
     return JSON.stringify(arg);
   } catch (e) {
@@ skipping 401 matching lines @@
   { object: obj, name: "1", type: "reconfigured" },
   { object: obj, name: "1", type: "updated", oldValue: 9 },
   { object: obj, name: "1", type: "updated", oldValue: 10 },
   { object: obj, name: "1", type: "updated", oldValue: 11 },
   { object: obj, name: "1", type: "updated", oldValue: 12 },
   { object: obj, name: "1", type: "deleted", oldValue: 36 },
   { object: obj, name: "1", type: "new" },
 ]);
 
 
+// Observing symbol properties (not).
+print("*****")
+reset();
+var obj = {}
+var symbol = Symbol("secret");
+Object.observe(obj, observer.callback);
+obj[symbol] = 3;
+delete obj[symbol];
+Object.defineProperty(obj, symbol, {get: function() {}, configurable: true});
+Object.defineProperty(obj, symbol, {value: 6});
+Object.defineProperty(obj, symbol, {writable: false});
+delete obj[symbol];
+Object.defineProperty(obj, symbol, {value: 7});
+++obj[symbol];
+obj[symbol]++;
+obj[symbol] *= 3;
+delete obj[symbol];
+obj.__defineSetter__(symbol, function() {});
+obj.__defineGetter__(symbol, function() {});
+Object.deliverChangeRecords(observer.callback);
+observer.assertNotCalled();
+
+
 // Test all kinds of objects generically.
 function TestObserveConfigurable(obj, prop) {
   reset();
   obj[prop] = 1;
   Object.observe(obj, observer.callback);
   obj[prop] = 2;
   obj[prop] = 3;
   delete obj[prop];
   obj[prop] = 4;
   obj[prop] = 4;  // ignored
@@ skipping 586 matching lines @@
     for (var n1 = 0; n1 < 3; ++n1)
       for (var n2 = 0; n2 < 3; ++n2)
         for (var i in mutation)
           TestFastElementsLength(mutation[i], b1 != 0, b2 != 0, 20*n1, 20*n2);
 
 for (var b1 = 0; b1 < 2; ++b1)
   for (var b2 = 0; b2 < 2; ++b2)
     for (var n = 0; n < 3; ++n)
       for (var i in mutationByIncr)
         TestFastElementsLength(mutationByIncr[i], b1 != 0, b2 != 0, 7*n, 7*n+1);