Updated XHR API so call sites are more descriptive.

remoting/webapp/crd/js/session_connector_impl.js

Index: remoting/webapp/crd/js/session_connector_impl.js
diff --git a/remoting/webapp/crd/js/session_connector_impl.js b/remoting/webapp/crd/js/session_connector_impl.js
index a14d3a8b7351915abc569fffe6af4f8e27077f0a..b8d070cbd70a550ca1fce19ac4412838cd88a19e 100644
--- a/remoting/webapp/crd/js/session_connector_impl.js
+++ b/remoting/webapp/crd/js/session_connector_impl.js
@@ -110,7 +110,7 @@ remoting.SessionConnectorImpl.prototype.resetConnection_ = function() {
   /** @private {remoting.DesktopConnectedView} */
   this.connectedView_ = null;
 
-  /** @private {XMLHttpRequest} */
+  /** @private {remoting.Xhr} */
   this.pendingXhr_ = null;
 
   /** @private {remoting.CredentialsProvider} */
@@ -331,10 +331,12 @@ remoting.SessionConnectorImpl.prototype.createSession_ = function() {
   this.host_.options.load().then(function(){
     that.plugin_.initialize(that.onPluginInitialized_.bind(that));
   });
+  this.pendingXhr_.then(this.onIT2MeHostInfo_.bind(this, hostId));
 };
 
 /**
  * @param {boolean} initialized
+ *     support-hosts query.
  * @private
  */
 remoting.SessionConnectorImpl.prototype.onPluginInitialized_ = function(