build: remove unused dependencies (#12346)

* Removes unused dependencies.

BUILD.bazel

@@ -30,7 +30,6 @@ filegroup(
     "tsickle",
     "tslib",
     "tslint",
-    "tsutils",
     "typescript",
     "zone.js",
   ] for ext in [

package.json

@@ -65,7 +65,6 @@
     "@types/node": "^7.0.21",
     "@types/run-sequence": "^0.0.29",
     "autoprefixer": "^6.7.6",
-    "axe-core": "^2.3.1",
     "axe-webdriverjs": "^1.1.1",
     "chalk": "^1.1.3",
     "codelyzer": "^4.3.0",
@@ -98,9 +97,7 @@
     "hammerjs": "^2.0.8",
     "highlight.js": "^9.11.0",
     "http-rewrite-middleware": "^0.1.6",
-    "image-diff": "^1.6.3",
     "jasmine-core": "2.8.0",
-    "jsonwebtoken": "^7.4.1",
     "karma": "^2.0.4",
     "karma-browserstack-launcher": "^1.3.0",
     "karma-chrome-launcher": "^2.2.0",
@@ -130,7 +127,6 @@
     "ts-node": "^3.0.4",
     "tsconfig-paths": "^2.3.0",
     "tslint": "^5.11.0",
-    "tsutils": "^2.6.0",
     "typescript": "2.7.x",
     "uglify-js": "^2.8.14"
   }