Enable ES6 iteration by default

test/mjsunit/harmony/generators-iteration.js

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-// Flags: --harmony-generators --expose-gc --harmony-iteration
+// Flags: --harmony-generators --expose-gc
 
 // Test generator iteration.
 
 var GeneratorFunction = (function*(){yield 1;}).__proto__.constructor;
 
 function assertIteratorResult(value, done, result) {
   assertEquals({ value: value, done: done}, result);
 }
 
 function assertIteratorIsClosed(iter) {
@@ skipping 650 matching lines @@
   function TestThrowRecursion() {
     function* g() { yield iter.throw(1); }
     var iter = g();
     return iter.next();
   }
   assertThrows(TestNextRecursion, Error);
   assertThrows(TestSendRecursion, Error);
   assertThrows(TestThrowRecursion, Error);
 }
 TestRecursion();