Revert "refactor: add license header to JS files & format files (#12035)"

This reverts commit 8310c91823.

modules/@angular/forms/rollup.config.js

@@ -1,10 +1,3 @@
-/**
- * @license
- * Copyright Google Inc. All Rights Reserved.
- *
- * Use of this source code is governed by an MIT-style license that can be
- * found in the LICENSE file at https://angular.io/license
- */
 
 export default {
   entry: '../../../dist/packages-dist/forms/index.js',
@@ -20,4 +13,4 @@ export default {
     'rxjs/observable/fromPromise': 'Rx.Observable',
     'rxjs/operator/toPromise': 'Rx.Observable.prototype'
   }
-};
+}