fixup! refactor(@angular-devkit/build-angular): remove protractor

Author: hawkgs

packages/angular_devkit/build_angular/builders.json

@@ -32,11 +32,6 @@
       "schema": "./src/builders/karma/schema.json",
       "description": "Run Karma unit tests."
     },
-    "web-test-runner": {
-      "implementation": "./src/builders/web-test-runner",
-      "schema": "./src/builders/web-test-runner/schema.json",
-      "description": "Run unit tests with Web Test Runner."
-    },
     "server": {
       "implementation": "./src/builders/server",
       "schema": "./src/builders/server/schema.json",