Download the host components when user tries to enable Me2Me host.

remoting/webapp/host_controller.js

Index: remoting/webapp/host_controller.js
diff --git a/remoting/webapp/host_controller.js b/remoting/webapp/host_controller.js
index 21485b12554416ca61e847505cb4114697aa27f6..cf20f1b12bca69aa882b571d6d330e7e7f7b326d 100644
--- a/remoting/webapp/host_controller.js
+++ b/remoting/webapp/host_controller.js
@@ -15,6 +15,10 @@ remoting.HostController = function() {
     /** @type {HTMLElement} @private */
     var container = document.getElementById('daemon-plugin-container');
     container.appendChild(plugin);
+    if (plugin.hasOwnProperty('REQUESTED_ACCESS_CODE')) {
+      container.removeChild(plugin);
+      return null;
+    }
     return plugin;
   };
 
@@ -472,5 +476,13 @@ remoting.HostController.prototype.clearPairedClients = function(
   this.hostDispatcher_.clearPairedClients(onDone, onError);
 };
 
+/**
+ * Returns true if the NPAPI plugin is being used.
+ * @return {boolean}
+ */
+remoting.HostController.prototype.usingNpapiPlugin = function() {
+  return this.hostDispatcher_.usingNpapiPlugin();
+}
+
 /** @type {remoting.HostController} */
 remoting.hostController = null;