Delete unused code (firebase#1789)

Author: mmermerkaya

packages/firebase/rollup.config.js

@@ -26,24 +26,6 @@ import { terser } from 'rollup-plugin-terser';
 import pkg from './package.json';
 
 import appPkg from './app/package.json';
-import authPkg from './auth/package.json';
-import databasePkg from './database/package.json';
-import firestorePkg from './firestore/package.json';
-import functionsPkg from './functions/package.json';
-import messagingPkg from './messaging/package.json';
-import storagePkg from './storage/package.json';
-import performancePkg from './performance/package.json';
-
-const pkgsByName = {
-  app: appPkg,
-  auth: authPkg,
-  database: databasePkg,
-  firestore: firestorePkg,
-  functions: functionsPkg,
-  messaging: messagingPkg,
-  storage: storagePkg,
-  performance: performancePkg
-};
 
 const plugins = [
   sourcemaps(),