[test] Fix typo in assertInstanceOf in mjsunit.js.

test/mjsunit/mjsunit.js

 // Copyright 2008 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
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 381 matching lines @@
   };
 
 
   assertInstanceof = function assertInstanceof(obj, type) {
     if (!(obj instanceof type)) {
       var actualTypeName = null;
       var actualConstructor = Object.getPrototypeOf(obj).constructor;
       if (typeof actualConstructor === "function") {
         actualTypeName = actualConstructor.name || String(actualConstructor);
       }
-      failWithmessage("Object <" + PrettyPrint(obj) + "> is not an instance of <" +
+      failWithMessage("Object <" + PrettyPrint(obj) + "> is not an instance of <" +
                (type.name || type) + ">" +
                (actualTypeName ? " but of <" + actualTypeName + ">" : ""));
     }
   };
 
 
    assertDoesNotThrow = function assertDoesNotThrow(code, name_opt) {
     try {
       if (typeof code === 'function') {
         code();
@@ skipping 47 matching lines @@
     if (sync_opt === undefined) sync_opt = "";
     assertTrue(OptimizationStatus(fun, sync_opt) !== 1, name_opt);
   }
 
   assertOptimized = function assertOptimized(fun, sync_opt, name_opt) {
     if (sync_opt === undefined) sync_opt = "";
     assertTrue(OptimizationStatus(fun, sync_opt) !== 2, name_opt);
   }
 
 })();