[ios] Corrected Closure annotation for getEmbedChild_ function.

ios/web/web_state/js/resources/plugin_placeholder.js

 // Copyright 2013 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.
 
 // This file adheres to closure-compiler conventions in order to enable
 // compilation with ADVANCED_OPTIMIZATIONS. See http://goo.gl/FwOgy
 //
 // Installs and runs the plugin placeholder function on the |__gCrWeb| object.
 
 /**
@@ skipping 24 matching lines @@
       'TdPcAq8mtjjunyFEtN8ohfOWaVZR88Qd2WKK15a5zoRY8ZmRaNIZ/yCZ/P1u0zY+9TASjc' +
       'q04YMzBhqAAUBXf5iWcITGdql3aTtpIZVnxGYvSxj1VPXUB0EtHnxBoT6iwgeXEwQfwC69' +
       'xmROAcr5DwESxa3XLGW9G9AgPGVKahzzb/UvEcq81PwCl/MyDMrUgxQeMH7tNniQW6nPKA' +
       'e5TU3KUFjPmTRxyofUsFeFVQqyENBHDAYyodJhR0CFrnfaYECgvAjdogEwZCVySQaJ8Zeq' +
       'AL874rsy+2ofT1ev5fkSdmihwF0jpOra/kskTHkGMckkG9Gg7Xvw9XtifXOy/GEgCr7H/r' +
       'yepFOFy5fu1agI9XH71RbRWRrDmHOhrfLYrx9ndv3Wz98R+P7LgG2uyMvgAAAABJRU5Erk' +
       'Jggg==';
 
   /**
    * Returns the first <embed> child of the given node, if any.
-   * @param {HTMLElement} node The node to check.
-   * @return {HTMLElement} The first <embed> child, or null.
+   * @param {Node} node The node to check.
+   * @return {Node} The first <embed> child, or null.
    * @private
    */
   __gCrWeb['plugin'].getEmbedChild_ = function(node) {
     if (node.hasChildNodes()) {
       for (var i = 0; i < node.childNodes.length; i++) {
         if (node.childNodes[i].nodeName === 'EMBED') {
           return node.childNodes[i];
         }
       }
     }
@@ skipping 133 matching lines @@
       label.style.marginTop = imageSize + 'px';
       // Center horizontally.
       label.style.textAlign = 'center';
       label.textContent = message;
       placeholderBox.appendChild(label);
 
       plugin.insertBefore(placeholder, plugin.firstChild);
     }
   };
 }());  // End of anonymous object