Added HostListApl implementation to connect to legacy directory and GCD.

remoting/webapp/crd/js/host_controller.js

Index: remoting/webapp/crd/js/host_controller.js
diff --git a/remoting/webapp/crd/js/host_controller.js b/remoting/webapp/crd/js/host_controller.js
index 730b8822a4ab02c0fb538b5a7bc7653e630422a5..0512c9272dfb6dd33a98cb56914c7307af2fc7e8 100644
--- a/remoting/webapp/crd/js/host_controller.js
+++ b/remoting/webapp/crd/js/host_controller.js
@@ -357,7 +357,8 @@ remoting.HostController.prototype.updatePin = function(newPin, onDone,
       return;
     }
     /** @type {string} */
-    var hostId = config['host_id'];
+    var hostId = remoting.HostListApi.getInstance().getHostIdFromConfig(
+        /** @type {!Object} */ (config));
     that.hostDaemonFacade_.getPinHash(hostId, newPin).then(
         updateDaemonConfigWithHash, remoting.Error.handler(onError));
   }
@@ -397,10 +398,8 @@ remoting.HostController.prototype.getLocalHostId = function(onDone) {
   function onConfig(config) {
     var hostId = null;
     if (isHostConfigValid_(config)) {
-      // Use the |gcd_device_id| field if it exists, or the |host_id|
-      // field otherwise.
-      hostId = base.getStringAttr(
-          config, 'gcd_device_id', base.getStringAttr(config, 'host_id'));
+      hostId = remoting.HostListApi.getInstance().getHostIdFromConfig(
+          /** @type {!Object} */ (config));
     }
     onDone(hostId);
   };