[Chromoting] Move shared webapp JS files from crd/js -> base/js

remoting/webapp/base/js/client_session.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
  * Class handling creation and teardown of a remoting client session.
  *
  * The ClientSession class controls lifetime of the client plugin
  * object and provides the plugin with the functionality it needs to
@@ skipping 587 matching lines @@
  * For example, if attempting a connection using a cached JID, host-offline
  * errors should not be logged because the JID will be refreshed and the
  * connection retried.
  *
  * @param {boolean} enable True to log host-offline errors; false to suppress.
  */
 remoting.ClientSession.prototype.logHostOfflineErrors = function(enable) {
   this.logHostOfflineErrors_ = enable;
 };