Enable ES6 Symbols by default

test/mjsunit/harmony/iteration-semantics.js

 // Copyright 2013 the V8 project authors. All rights reserved.
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 // 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.
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 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
 //       with the distribution.
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 //       from this software without specific prior written permission.
 //
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 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --harmony-iteration
 // Flags: --harmony-generators --harmony-scoping --harmony-proxies
-// Flags: --harmony-symbols
 
 // Test for-of semantics.
 
 "use strict";
 
 
 // First, some helpers.
 
 function* values() {
   for (var i = 0; i < arguments.length; i++) {
@@ skipping 288 matching lines @@
       if (name == 'next' && n-- < 0) throw "unreachable";
       return iterator[name];
     },
     // Needed for integers_until(10)'s this.n++.
     set: function(receiver, name, val) {
       return iterator[name] = val;
     }
   }));
 }
 assertEquals(45, fold(sum, 0, poison_proxy_after(integers_until(10), 10)));