[Chromoting] Enable jscompile for webapp unittests.

remoting/webapp/unittests/xmpp_login_handler_unittest.js

Index: remoting/webapp/unittests/xmpp_login_handler_unittest.js
diff --git a/remoting/webapp/unittests/xmpp_login_handler_unittest.js b/remoting/webapp/unittests/xmpp_login_handler_unittest.js
index 2b1adfd00831c3aa29a9829b08afaf6b4e48ec3b..281cd50bcf73d063b824edc93b54922d82f25a57 100644
--- a/remoting/webapp/unittests/xmpp_login_handler_unittest.js
+++ b/remoting/webapp/unittests/xmpp_login_handler_unittest.js
@@ -9,11 +9,19 @@
 var testUsername = 'testUsername@gmail.com';
 var testToken = 'testToken';
 
-var sendMessage = null;
-var startTls = null;
-var onHandshakeDone = null;
-var onStanzaStr = null;
-var onError = null;
+/** @type {(sinon.$spy|function(string):void)} */
+var sendMessage = function(msg) {};
+
+/** @type {(sinon.$spy|function():void)} */
+var startTls = function() {};
+
+/** @type {(sinon.$spy|function(string, remoting.XmppStreamParser):void)} */
+var onHandshakeDone = function(name, parser) {};
+
+/** @type {(sinon.$spy|function(remoting.Error, string):void)} */
+var onError = function(error, message) {};
+
+/** @type {remoting.XmppLoginHandler} */
 var loginHandler = null;
 
 module('XmppLoginHandler', {
@@ -22,9 +30,14 @@ module('XmppLoginHandler', {
     startTls = sinon.spy();
     onHandshakeDone = sinon.spy();
     onError = sinon.spy();
+
     loginHandler = new remoting.XmppLoginHandler(
-        'google.com', testUsername, testToken, false, sendMessage,
-        startTls, onHandshakeDone, onError);
+        'google.com', testUsername, testToken, false,
+        /** @type {function(string):void} */ (sendMessage),
+        /** @type {function():void} */ (startTls),
+        /** @type {function(string, remoting.XmppStreamParser):void} */
+            (onHandshakeDone),
+        /** @type {function(remoting.Error, string):void} */ (onError));
   }
 });