fix(decorators): updates missing benchmark and fixes typo.

Author: rkirov

modules/angular2/src/core/decorators/decorators.es6

@@ -8,7 +8,7 @@ import {AttributeAnnotation, QueryAnnotation} from '../annotations/di';
 
 function makeDecorator(annotationCls) {
   return function(...args) {
-    if (!(window.Reflect && !window.Reflect.getMetadata)) throw 'reflect-metadata shim is required';
+    if (!(window.Reflect && window.Reflect.getMetadata)) throw 'reflect-metadata shim is required';
     var annotationInstance = new annotationCls(...args);
     var Reflect = window.Reflect;
     return function(cls) {

modules/benchmarks/src/tree/tree_benchmark.js

@@ -1,4 +1,9 @@
-import {bootstrap, Component, View, ViewContainerRef, Compiler, Decorator} from 'angular2/angular2';
+import {bootstrap, ViewContainerRef, Compiler} from 'angular2/angular2';
+
+// TODO(radokirov): Once the application is transpiled by TS instead of Traceur,
+// add those imports back into 'angular2/angular2';
+import {Component, Decorator} from 'angular2/src/core/annotations_impl/annotations';
+import {View} from 'angular2/src/core/annotations_impl/view';
 
 import {LifeCycle} from 'angular2/src/core/life_cycle/life_cycle';
 import {reflector} from 'angular2/src/reflection/reflection';