Update Chromoting to use /third_party/closure_compiler.

remoting/webapp/crd/js/hangout_session.js

Index: remoting/webapp/crd/js/hangout_session.js
diff --git a/remoting/webapp/crd/js/hangout_session.js b/remoting/webapp/crd/js/hangout_session.js
index 7776f156d57861c4b8bbda3b8d7d6207bf07a78e..32d0200d3de42c596e35bd25e8fd5b301d658012 100644
--- a/remoting/webapp/crd/js/hangout_session.js
+++ b/remoting/webapp/crd/js/hangout_session.js
@@ -43,16 +43,16 @@ remoting.HangoutSession.prototype.init = function() {
 };
 
 /**
- * @param {remoting.ClientSession.State} state
+ * @param {remoting.ClientSession.State=} state
  */
 remoting.HangoutSession.prototype.onSessionStateChanged_ = function(state) {
   var State = remoting.ClientSession.State;
   try {
     this.port_.postMessage({method: 'sessionStateChanged', state: state});
-  } catch (e) {
+  } catch (/** @type {*} */ e) {
     // postMessage will throw an exception if the port is disconnected.
     // We can safely ignore this exception.
-    var error = /** @type {Error} */ e;
+    var error = /** @type {Error} */ (e);
     console.error(error);
   } finally {
     if (state === State.FAILED || state === State.CLOSED) {
@@ -79,4 +79,4 @@ remoting.hangoutSessionEvents = new base.EventSource();
 remoting.hangoutSessionEvents.sessionStateChanged = "sessionStateChanged";
 
 remoting.hangoutSessionEvents.defineEvents(
-    [remoting.hangoutSessionEvents.sessionStateChanged]);
+    [remoting.hangoutSessionEvents.sessionStateChanged]);