Enable ES6 Symbols by default

test/mjsunit/harmony/private.js

 // Copyright 2013 the V8 project authors. All rights reserved.
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 //
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 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Flags: --harmony-symbols --harmony-collections
+// Flags: --harmony-collections
 // Flags: --expose-gc --allow-natives-syntax
 
 var symbols = []
 
 
 // Returns true if the string is a valid
 // serialization of Symbols added to the 'symbols'
 // array. Adjust if you extend 'symbols' with other
 // values.
 function isValidSymbolString(s) {
@@ skipping 311 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)