Converted remoting.Error from an enum to a class

remoting/webapp/crd/js/oauth2.js

 // Copyright (c) 2012 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.
 
 /**
  * @fileoverview
  * OAuth2 class that handles retrieval/storage of an OAuth2 token.
  *
  * Uses a content script to trampoline the OAuth redirect page back into the
  * extension context.  This works around the lack of native support for
@@ skipping 303 matching lines @@
 };
 
 /**
  * Asynchronously exchanges an authorization code for a refresh token.
  *
  * @param {string} code The OAuth2 authorization code.
  * @param {function():void} onDone Callback to invoke on completion.
  * @return {void} Nothing.
  */
 remoting.OAuth2.prototype.exchangeCodeForToken = function(code, onDone) {
-  /** @param {remoting.Error} error */
+  /** @param {!remoting.Error} error */
   var onError = function(error) {
     console.error('Unable to exchange code for token: ', error);
   };
 
   remoting.oauth2Api.exchangeCodeForTokens(
       this.onTokens_.bind(this, onDone), onError,
       this.getClientId_(), this.getClientSecret_(), code,
       this.getRedirectUri_());
 };
 
@@ skipping 106 matching lines @@
       window.localStorage.setItem(that.KEY_FULLNAME_, name);
       resolve({email: email, name: name});
     };
 
     that.getToken().then(
         remoting.oauth2Api.getUserInfo.bind(
             remoting.oauth2Api, onResponse, reject),
         reject);
   });
 };