[Chromoting] Show any startup errors in the LoadingWindow.

remoting/webapp/app_remoting/js/app_remoting_activity.js

 // Copyright 2015 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.
 
 /** @suppress {duplicate} */
 var remoting = remoting || {};
 
 /**
  * Type definition for the RunApplicationResponse returned by the API.
  * @typedef {{
@@ skipping 171 matching lines @@
   } else {
     this.showErrorMessage_(error);
   }
   this.cleanup_();
 };
 
 /**
  * @param {!remoting.Error} error
  */
 remoting.AppRemotingActivity.prototype.onConnectionFailed = function(error) {
-  remoting.LoadingWindow.close();
-  this.showErrorMessage_(error);
+  remoting.loadingWindow_.updateErrorMessage(
+      chrome.i18n.getMessage(error.getTag()));
   this.cleanup_();
 };
 
 /**
  * @param {!remoting.Error} error The error to be localized and displayed.
  * @private
  */
 remoting.AppRemotingActivity.prototype.showErrorMessage_ = function(error) {
-  console.error('Connection failed: ' + error.toString());
+  console.error('Error: ' + error.toString());
   remoting.MessageWindow.showErrorMessage(
       remoting.app.getApplicationName(),
       chrome.i18n.getMessage(error.getTag()));
 };
 
 })();