Move test for enabling/disabling It2Me Share button

remoting/webapp/remoting.js

Index: remoting/webapp/remoting.js
diff --git a/remoting/webapp/remoting.js b/remoting/webapp/remoting.js
index 0989777bce319f6b04724dc4fb5262f1e1a1b95b..68928fe3bf66274a03000af0945e4559ff766e30 100644
--- a/remoting/webapp/remoting.js
+++ b/remoting/webapp/remoting.js
@@ -125,13 +125,27 @@ remoting.onEmail = function(email) {
 };
 
 /**
+ * Returns whether or not IT2Me is supported via the host NPAPI plugin.
+ *
+ * @return {boolean}
+ */
+function isIT2MeSupported_() {
+  var container = document.getElementById('host-plugin-container');
+  /** @type {remoting.HostPlugin} */
+  var plugin = remoting.HostSession.createPlugin();
+  container.appendChild(plugin);
+  var result = plugin.hasOwnProperty('REQUESTED_ACCESS_CODE');
+  container.removeChild(plugin);
+  return result;
+}
+
+/**
  * initHomeScreenUi is called if the app is not starting up in session mode,
  * and also if the user cancels pin entry or the connection in session mode.
  */
 remoting.initHomeScreenUi = function() {
   remoting.hostController = new remoting.HostController();
-  document.getElementById('share-button').disabled =
-      !remoting.hostController.isPluginSupported();
+  document.getElementById('share-button').disabled = !isIT2MeSupported_();
   remoting.setMode(remoting.AppMode.HOME);
   if (!remoting.oauth2.isAuthenticated()) {
     document.getElementById('auth-dialog').hidden = false;