Delete and recreate the client plugin if WCS is reloaded.

remoting/webapp/wcs_sandbox_content.js

Index: remoting/webapp/wcs_sandbox_content.js
diff --git a/remoting/webapp/wcs_sandbox_content.js b/remoting/webapp/wcs_sandbox_content.js
index b97f6a4c6dc8eee2c2d72cd0d40a6e0c6c1227b1..8de46633731412c76617e6045bc39db7e6a3d850 100644
--- a/remoting/webapp/wcs_sandbox_content.js
+++ b/remoting/webapp/wcs_sandbox_content.js
@@ -75,7 +75,7 @@ remoting.WcsSandboxContent.prototype.onMessage_ = function(event) {
       } else if (!remoting.wcsLoader) {
         remoting.wcsLoader = new remoting.WcsLoader();
         remoting.wcsLoader.start(token,
-                                 this.onReady_.bind(this),
+                                 this.onLocalJid_.bind(this),
                                  this.onError_.bind(this));
       }
       break;
@@ -121,10 +121,10 @@ remoting.WcsSandboxContent.prototype.onMessage_ = function(event) {
  * @param {string} clientJid The full JID of the WCS client.
  * @private
  */
-remoting.WcsSandboxContent.prototype.onReady_ = function(clientJid) {
+remoting.WcsSandboxContent.prototype.onLocalJid_ = function(clientJid) {
   remoting.wcs.setOnIq(this.onIq_.bind(this));
   var message = {
-    'command': 'onReady',
+    'command': 'onLocalJid',
     'clientJid': clientJid
   };
   this.parentWindow_.postMessage(message, '*');