Currently the Chromoting class is messy, with callbacks and listeners everywhere. Since there are promise and event available in our code base. To improve code readability and maintainability, we can use base.Promise to rewrite async sequences and chromoting.Event to rewrite event listener bindings.

I think the good time for us to start refactoring these is after N SDK is rolled-in (and stabilized) and we are able to write lambdas.