Cleanup main.ts.

src/main.ts

@@ -1,12 +1,7 @@
 // vim: set tw=80 ts=2 sw=2 sts=2 :
 
 import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
-import { enableProdMode } from '@angular/core';
 
 import { AppModule } from './app.module';
 
-if (process.env.ENV === 'production') {
-  enableProdMode();
-}
-
 platformBrowserDynamic().bootstrapModule(AppModule);