Enable ES6 Map and Set by default

test/mjsunit/es6/symbols.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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-// 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 454 matching lines @@
   Realm.shared = symbol1
   assertSame("x1", Realm.eval(realm, "Symbol.keyFor(Realm.shared)"))
 
   var symbol3 = Realm.eval(realm, "Symbol.for('x3')")
   assertFalse(symbol1 === symbol3)
   assertFalse(symbol2 === symbol3)
   assertSame(symbol3, Symbol.for("x3"))
   assertSame("x3", Symbol.keyFor(symbol3))
 }
 TestRegistry()