Fix script error on disconnect.

remoting/webapp/base/js/connected_view.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
  * Implements a basic UX control for a connected remoting session.
  */
 
 /** @suppress {duplicate} */
@@ skipping 34 matching lines @@
   /** @private */
   this.disposables_ = new base.Disposables(
     this.cursor_,
     new base.DomEventHook(pluginElement, 'blur',
                           this.onPluginLostFocus_.bind(this), false),
     new base.DomEventHook(document, 'visibilitychange',
                           this.onVisibilityChanged_.bind(this), false),
     new remoting.Clipboard(plugin)
   );
 
+  /** @private {base.OneShotTimer} */
+  this.restoreFocusTimer_ = null;
+
   // TODO(wez): Only allow mouse lock if the app has the pointerLock permission.
   this.plugin_.allowMouseLock();
 
   pluginElement.focus();
 };
 
 /**
  * @return {void} Nothing.
  */
 remoting.ConnectedView.prototype.dispose = function() {
   base.dispose(this.disposables_);
   this.disposables_ = null;
   this.cursorRender_ = null;
   this.plugin_ = null;
+  base.dispose(this.restoreFocusTimer_);
+  this.restoreFocusTimer_ = null;
 };
 
 /**
  * Called when the app window is hidden.
  * @return {void} Nothing.
  * @private
  */
 remoting.ConnectedView.prototype.onVisibilityChanged_ = function() {
   var pause = document.hidden;
   this.plugin_.pauseVideo(pause);
@@ skipping 15 matching lines @@
  * @private
  */
 remoting.ConnectedView.prototype.onPluginLostFocus_ = function(event) {
   // Release all keys to prevent them becoming 'stuck down' on the host.
   this.plugin_.releaseAllKeys();
 
   // Focus should stay on the element, not (for example) the toolbar.
   // Due to crbug.com/246335, we can't restore the focus immediately,
   // otherwise the plugin gets confused about whether or not it has focus.
   var that = this;
-  var delayedCallback = function() {
+  base.dispose(this.restoreFocusTimer_);
+  this.restoreFocusTimer_ = new base.OneShotTimer(function() {
     // When the 'blur' event handler is called document.activeElement has not
     // been set to the correct target. We need to retrieve the target in this
     // delayedCallback.
     var target = /** @type {!HTMLElement} */ (document.activeElement);
     if (!that.isElementFocusable_(target)) {
       that.plugin_.element().focus();
     }
-  };
-  window.setTimeout(delayedCallback, 0);
+  }, 0);
 };
 
 /**
  * Return focus to the plugin.
  */
 remoting.ConnectedView.prototype.returnFocusToPlugin = function() {
   this.plugin_.element().focus();
 };
 
 /**
@@ skipping 102 matching lines @@
 /**
  * @param {Event} event
  * @private
  */
 remoting.ConnectedView.Cursor.prototype.onMouseMoved_ = function(event) {
   this.cursorElement_.style.top = event.offsetY + 'px';
   this.cursorElement_.style.left = event.offsetX + 'px';
 };
 
 })();