Converted remoting.Error from an enum to a class

remoting/webapp/crd/js/fallback_signal_strategy.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.
 
 'use strict';
 
 /** @suppress {duplicate} */
 var remoting = remoting || {};
 
 /**
@@ skipping 164 matching lines @@
   this.connectionSetupResults_ = [];
 };
 
 /** @return {remoting.SignalStrategy.State} Current state */
 remoting.FallbackSignalStrategy.prototype.getState = function() {
   return (this.externalState_ === null)
       ? remoting.SignalStrategy.State.NOT_CONNECTED
       : this.externalState_;
 };
 
-/** @return {remoting.Error} Error when in FAILED state. */
+/** @return {!remoting.Error} Error when in FAILED state. */
 remoting.FallbackSignalStrategy.prototype.getError = function() {
   base.debug.assert(this.state_ == this.State.SECONDARY_FAILED);
   base.debug.assert(
       this.secondary_.getState() == remoting.SignalStrategy.State.FAILED);
   return this.secondary_.getError();
 };
 
 /** @return {string} Current JID when in CONNECTED state. */
 remoting.FallbackSignalStrategy.prototype.getJid = function() {
   return this.getConnectedSignalStrategy_().getJid();
@@ skipping 152 matching lines @@
   console.log('FallbackSignalStrategy progress: ' + strategy.getType() + ' ' +
       progress);
   this.connectionSetupResults_.push({
     'strategyType': strategy.getType(),
     'progress': progress
   });
   if (this.logToServer_) {
     this.sendConnectionSetupResultsInternal_();
   }
 };