Allow muting the Angular 2 mode printing in the browser console. #6540
Description
The current implementation prints out the mode of Angular 2 to the browser's console
(see application_ref.ts ). In Dart it's not even possible to call enableDevMode() any more, since it's a no-op now.
Please add an option to mute this output (other than manually rebinding the Console) so that it's possible to have production code clean of any debug / diagnostic printouts.