revert: style(ngFor): add whitespace to `Directive` annotation

Reverted from commit 35597a8349

This style change makes the docs look nicer but clang-format doesn't
like it. @mhevery perhaps we can tweak the clang-format rules for this?

modules/angular2/src/directives/ng_for.ts

@@ -33,11 +33,8 @@ import {isPresent, isBlank} from 'angular2/src/facade/lang';
  * - `<li template="ng-for #item of items; #i = index">...</li>`
  * - `<template ng-for #item [ng-for-of]="items" #i="index"><li>...</li></template>`
  */
-@Directive({
-  selector: '[ng-for][ng-for-of]',
-  properties: ['ngForOf'],
-  lifecycle: [LifecycleEvent.onCheck]
-})
+@Directive(
+    {selector: '[ng-for][ng-for-of]', properties: ['ngForOf'], lifecycle: [LifecycleEvent.onCheck]})
 export class NgFor {
   _ngForOf: any;
   _pipe: Pipe;