Updated remoting.xhr API to use promises. Removed access to the native

remoting/webapp/crd/js/it2me_connect_flow.js

Index: remoting/webapp/crd/js/it2me_connect_flow.js
diff --git a/remoting/webapp/crd/js/it2me_connect_flow.js b/remoting/webapp/crd/js/it2me_connect_flow.js
index 20f42c2c65701f73323d2795183679a21ab96474..42b5d08055bbac3f29ccede30089f7465adba967 100644
--- a/remoting/webapp/crd/js/it2me_connect_flow.js
+++ b/remoting/webapp/crd/js/it2me_connect_flow.js
@@ -88,20 +88,17 @@ remoting.It2MeConnectFlow.prototype.verifyAccessCode_ = function(accessCode) {
  * Continues an IT2Me connection once an access token has been obtained.
  *
  * @param {string} token An OAuth2 access token.
- * @return {Promise<XMLHttpRequest>}
+ * @return {Promise<remoting.Xhr.Response>}
  * @private
  */
 remoting.It2MeConnectFlow.prototype.getHostInfo_ = function(token) {
   var that = this;
-  return new Promise(function(resolve) {
-    remoting.xhr.start({
-      method: 'GET',
-      url: remoting.settings.DIRECTORY_API_BASE_URL + '/support-hosts/' +
-           encodeURIComponent(that.hostId_),
-      onDone: resolve,
-      oauthToken: token
-    });
-  });
+  return new remoting.Xhr({
+    method: 'GET',
+    url: remoting.settings.DIRECTORY_API_BASE_URL + '/support-hosts/' +
+        encodeURIComponent(that.hostId_),
+    oauthToken: token
+  }).start();
 };
 
 /**