Make regress-crbug-514081 less flaky by having max serialization size

test/mjsunit/regress/regress-crbug-514081.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.
 
 if (this.Worker) {
   var __v_7 = new Worker('onmessage = function() {};');
   var e;
+  var ab = new ArrayBuffer(2 * 1000 * 1000);
   try {
-    var ab = new ArrayBuffer(2147483648);
-    try {
-      __v_7.postMessage(ab);
-    } catch (e) {
-      // postMessage failed, should be a DataCloneError message.
-      assertContains('cloned', e.message);
-    }
+    __v_7.postMessage(ab);
+    threw = false;
   } catch (e) {
-    // Creating the ArrayBuffer failed.
-    assertInstanceof(e, RangeError);
+    // postMessage failed, should be a DataCloneError message.
+    assertContains('cloned', e.message);
+    threw = true;
   }
+  assertTrue(threw, 'Should throw when trying to serialize large message.');
 }