chore(lint): Added license headers to most TypeScript files

Relates to #9380

modules/@angular/platform-browser/src/browser.ts

@@ -1,3 +1,11 @@
+/**
+ * @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
+ */
+
 import {FORM_PROVIDERS, PlatformLocation} from '@angular/common';
 import {APPLICATION_COMMON_PROVIDERS, ExceptionHandler, OpaqueToken, PLATFORM_COMMON_PROVIDERS, PLATFORM_INITIALIZER, PlatformRef, ReflectiveInjector, RootRenderer, Testability, assertPlatform, createPlatform, getPlatform} from '@angular/core';