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

remoting/webapp/host_native_messaging.js

Index: remoting/webapp/host_native_messaging.js
diff --git a/remoting/webapp/host_native_messaging.js b/remoting/webapp/host_native_messaging.js
index 0d48b004091a97e14a077d26f1a4b41296147f86..3fc847343081cc7f7795aebd9062b4ebe637b684 100644
--- a/remoting/webapp/host_native_messaging.js
+++ b/remoting/webapp/host_native_messaging.js
@@ -365,11 +365,13 @@ remoting.HostNativeMessaging.prototype.onDisconnect_ = function() {
   console.error('Native Message port disconnected');
 
   // Notify the error-handlers of any requests that are still outstanding.
-  for (var id in this.pendingReplies_) {
-    this.pendingReplies_[/** @type {number} */(id)].onError(
+  var pendingReplies = this.pendingReplies_;
+  this.pendingReplies_ = {};
+
+  for (var id in pendingReplies) {
+    pendingReplies[/** @type {number} */(id)].onError(
         remoting.Error.UNEXPECTED);
   }
-  this.pendingReplies_ = {};
 }
 
 /**