[es6] Iterators and generators should "extend" %IteratorPrototype%

tools/gyp/v8.gyp

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # 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.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
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@@ skipping 1703 matching lines @@
           '../../src/symbol.js',
           '../../src/array.js',
           '../../src/string.js',
           '../../src/uri.js',
           '../../src/math.js',
           '../../src/third_party/fdlibm/fdlibm.js',
           '../../src/date.js',
           '../../src/regexp.js',
           '../../src/arraybuffer.js',
           '../../src/typedarray.js',
+          '../../src/iterator-prototype.js',
           '../../src/generator.js',
           '../../src/object-observe.js',
           '../../src/collection.js',
           '../../src/weak-collection.js',
           '../../src/collection-iterator.js',
           '../../src/promise.js',
           '../../src/messages.js',
           '../../src/json.js',
           '../../src/array-iterator.js',
           '../../src/string-iterator.js',
@@ skipping 147 matching lines @@
         }],
         ['want_separate_host_toolset==1', {
           'toolsets': ['host'],
         }, {
           'toolsets': ['target'],
         }],
       ],
     },
   ],
 }