fix(@schematics/angular): remove redundant ES2015 polyfills

Author: clydin

packages/schematics/angular/application/files/src/polyfills.ts

@@ -18,31 +18,9 @@
  * BROWSER POLYFILLS
  */
 
-/** IE9, IE10, IE11, and Chrome <55 requires all of the following polyfills.
- *  This also includes Android Emulators with older versions of Chrome and Google Search/Googlebot
- */
-
-// import 'core-js/es6/symbol';
-// import 'core-js/es6/object';
-// import 'core-js/es6/function';
-// import 'core-js/es6/parse-int';
-// import 'core-js/es6/parse-float';
-// import 'core-js/es6/number';
-// import 'core-js/es6/math';
-// import 'core-js/es6/string';
-// import 'core-js/es6/date';
-// import 'core-js/es6/array';
-// import 'core-js/es6/regexp';
-// import 'core-js/es6/map';
-// import 'core-js/es6/weak-map';
-// import 'core-js/es6/set';
-
 /** IE10 and IE11 requires the following for NgClass support on SVG elements */
 // import 'classlist.js';  // Run `npm install --save classlist.js`.
 
-/** IE10 and IE11 requires the following for the Reflect API. */
-// import 'core-js/es6/reflect';
-
 /**
  * Web Animations `@angular/platform-browser/animations`
  * Only required if AnimationBuilder is used within the application and using IE/Edge or Safari.