[Chromoting] Move the onBlur handler from window to the plugin element.

remoting/webapp/remoting.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.
 
 'use strict';
 
 /** @suppress {duplicate} */
 var remoting = remoting || {};
 
 /** @type {remoting.HostSession} */ remoting.hostSession = null;
@@ skipping 35 matching lines @@
   remoting.toolbar = new remoting.Toolbar(
       document.getElementById('session-toolbar'));
   remoting.clipboard = new remoting.Clipboard();
 
   refreshEmail_();
   var email = remoting.oauth2.getCachedEmail();
   if (email) {
     document.getElementById('current-email').innerText = email;
   }
 
-  window.addEventListener('blur', pluginLostFocus_, false);
   // The plugin's onFocus handler sends a paste command to |window|, because
   // it can't send one to the plugin element itself.
   window.addEventListener('paste', pluginGotPaste_, false);
 
   if (isHostModeSupported_()) {
     var noShare = document.getElementById('chrome-os-no-share');
     noShare.parentNode.removeChild(noShare);
   } else {
     var button = document.getElementById('share-button');
     button.disabled = true;
@@ skipping 76 matching lines @@
  */
 function pluginGotPaste_(eventUncast) {
   var event = /** @type {remoting.ClipboardEvent} */ eventUncast;
   if (event && event.clipboardData) {
     remoting.clipboard.toHost(event.clipboardData);
   }
   return false;
 }
 
 /**
- * Callback function called when the browser window loses focus. In this case,
- * release all keys to prevent them becoming 'stuck down' on the host.
- */
-function pluginLostFocus_() {
-  if (remoting.clientSession && remoting.clientSession.plugin) {
-    remoting.clientSession.plugin.releaseAllKeys();
-  }
-}
-
-/**
  * If the user is authenticated, but there is no email address cached, get one.
  */
 function refreshEmail_() {
   if (!getEmail_() && remoting.oauth2.isAuthenticated()) {
     remoting.oauth2.getEmail(setEmail_);
   }
 }
 
 /**
  * The key under which the email address is stored.
@@ skipping 53 matching lines @@
  */
 function getUrlParameters_() {
   var result = {};
   var parts = window.location.search.substring(1).split('&');
   for (var i = 0; i < parts.length; i++) {
     var pair = parts[i].split('=');
     result[pair[0]] = decodeURIComponent(pair[1]);
   }
   return result;
 }