Remove proxies from --harmony switch for M38, because problems

test/mjsunit/harmony/proxies-json.js

 // Copyright 2012 the V8 project authors. All rights reserved.
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-// Flags: --harmony
+// Flags: --harmony-proxies
 
 function testStringify(expected, object) {
   // Test fast case that bails out to slow case.
   assertEquals(expected, JSON.stringify(object));
   // Test slow case.
   assertEquals(expected, JSON.stringify(object, undefined, 0));
 }
 
 // Test serializing a proxy, function proxy and objects that contain them.
 var handler1 = {
@@ skipping 130 matching lines @@
     return { enumerable: true };
   }
 }
 
 var proxy7 = Proxy.create(handler7);
 var parent7 = { a: "1", b: proxy7, c: "3", d: "4" };
 assertEquals('{"a":"1","b":{"a":"A","b":"B","c":"C"},"d":"4"}',
              JSON.stringify(parent7));
 assertEquals('{"b":{"a":"A","b":"B","c":"C"},"d":"4","e":"5"}',
              JSON.stringify(parent7));