Remove runtime flags for Proxy and Reflect

test/mjsunit/messages.js

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --stack-size=100 --harmony --harmony-reflect --harmony-regexps
+// Flags: --stack-size=100 --harmony --harmony-regexps
 // Flags: --harmony-simd --harmony-instanceof
 
 function test(f, expected, type) {
   try {
     f();
   } catch (e) {
     assertInstanceof(e, type);
     assertEquals(expected, e.message);
     return;
   }
@@ skipping 429 matching lines @@
   Number(1).toString(100);
 }, "toString() radix argument must be between 2 and 36", RangeError);
 
 
 // === URIError ===
 
 // kURIMalformed
 test(function() {
   decodeURI("%%");
 }, "URI malformed", URIError);