refactor: remove no longer needed workaround for AJV

Author: alan-agius4

packages/angular_devkit/build_angular/package.json

@@ -19,7 +19,6 @@
     "@babel/template": "7.10.4",
     "@jsdevtools/coverage-istanbul-loader": "3.0.5",
     "@ngtools/webpack": "0.0.0",
-    "ajv": "6.12.3",
     "autoprefixer": "9.8.5",
     "babel-loader": "8.1.0",
     "browserslist": "^4.9.1",

packages/angular_devkit/build_angular/src/index.ts

@@ -6,13 +6,6 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-// TODO: remove this commented AJV require.
-// We don't actually require AJV, but there is a bug with NPM and peer dependencies that is
-// whose workaround is to depend on AJV.
-// See https://github.com/angular/angular-cli/issues/9691#issuecomment-367322703 for details.
-// We need to add a require here to satisfy the dependency checker.
-// require('ajv');
-
 export * from './transforms';
 
 export {