[Webapp Refactor] Remove remoting.SessionConnector.

remoting/webapp/base/js/protocol_extension.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.
 
 /**
  * @fileoverview
  * Interface abstracting the protocol extension functionality.
- * Instances of this class can be registered with the SessionConnector
+ * Instances of this class can be registered with the ProtocolExtensionManager
  * to enhance the communication protocol between the host and client.
  * Note that corresponding support on the host side is required.
  */
 
 'use strict';
 
 /** @suppress {duplicate} */
 var remoting = remoting || {};
 
 /**
@@ skipping 20 matching lines @@
 
 /**
  * Called when an extension message of a matching type is received.
  *
  * @param {string} type The message type.
  * @param {Object} message The parsed extension message data.
  * @return {boolean} True if the extension message was handled.
  */
 remoting.ProtocolExtension.prototype.onExtensionMessage =
     function(type, message) {};