Ensure `String.prototype.normalize.length` is `0`

test/intl/string/normalization.js

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 // Tests the new String.prototype.normalize method.
 
+assertEquals(String.prototype.normalize.length, 0);
+assertEquals(String.prototype.propertyIsEnumerable("normalize"), false);
 
 // Common use case when searching for 'not very exact' match.
 // These are examples of data one might encounter in real use.
 var testRealUseCases = function() {
   // Vietnamese legacy text, old Windows 9x / non-Unicode applications use
   // windows-1258 code page, which is neither precomposed, nor decomposed.
   assertEquals('ti\u00ea\u0301ng Vi\u00ea\u0323t'.normalize('NFKD'),
    'ti\u1ebfng Vi\u1ec7t'.normalize('NFKD')); // all precomposed
 
   // Various kinds of spaces
@@ skipping 96 matching lines @@
     for (var column = 0; column < 3; ++column) {
       var str = testData[i][column];
       assertEquals(str.normalize(), testData[i][kNFC]); // defaults to NFC
       assertEquals(str.normalize('NFC'), testData[i][kNFC]);
       assertEquals(str.normalize('NFD'), testData[i][kNFD]);
       assertEquals(str.normalize('NFKC'), testData[i][kNFKC]);
       assertEquals(str.normalize('NFKD'), testData[i][kNFKD]);
     }
   }
 }();