Converted remoting.Error from an enum to a class

remoting/webapp/unittests/xmpp_connection_unittest.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 (function() {
 
 'use strict';
 
 var testUsername = 'testUsername@gmail.com';
 var testToken = 'testToken';
@@ skipping 52 matching lines @@
   expectNextState(remoting.SignalStrategy.State.CONNECTING).then(onConnecting);
   connection.connect('xmpp.example.com:123', 'testUsername@gmail.com',
                      'testToken');
 
   function onConnecting() {
     expectNextState(remoting.SignalStrategy.State.FAILED).then(onFailed);
   }
 
   function onFailed() {
     sinon.assert.calledWith(socket.dispose);
-    QUnit.equal(connection.getError(), remoting.Error.NETWORK_FAILURE);
+    QUnit.equal(connection.getError().tag, remoting.Error.Tag.NETWORK_FAILURE);
 
     QUnit.start();
   }
 });
 
 QUnit.asyncTest('should use XmppLoginHandler for handshake', function() {
   $testStub(socket.connect).withArgs("xmpp.example.com", 123)
       .returns(new Promise(function(resolve, reject) { resolve(0) }));
 
   var deferredSend = new base.Deferred();
@@ skipping 29 matching lines @@
     var appendDataCalled =
         parserMock.expects('appendData').once().withArgs(data);
     $testStub(socket.startReceiving).getCall(0).args[0](data);
     appendDataCalled.verify();
 
     QUnit.start();
   }
 });
 
 })();