fix(build): Actually code in the subset of JS that Traceur-Dart supports.

Author: mprobst

modules/angular2/test/core/annotations/annotations_spec.js

@@ -2,7 +2,7 @@ import {ddescribe, describe, it, iit, expect, beforeEach} from 'angular2/test_li
 import {Directive, onChange} from 'angular2/src/core/annotations/annotations';
 
 class DummyDirective extends Directive {
-  constructor({lifecycle = []} = {}) { super({lifecycle: lifecycle}); }
+  constructor({lifecycle} = {}) { super({lifecycle: lifecycle}); }
 }
 
 export function main() {

modules/angular2/test/core/compiler/element_injector_spec.js

@@ -15,7 +15,7 @@ import {Directive} from 'angular2/src/core/annotations/annotations';
 import {BindingPropagationConfig} from 'angular2/change_detection';
 
 class DummyDirective extends Directive {
-  constructor({lifecycle = []} = {}) { super({lifecycle: lifecycle}); }
+  constructor({lifecycle} = {}) { super({lifecycle: lifecycle}); }
 }
 
 @proxy

modules/angular2/test/core/compiler/view_spec.js

@@ -18,7 +18,7 @@ import {EventManager, DomEventsPlugin} from 'angular2/src/core/events/event_mana
 import {reflector} from 'angular2/src/reflection/reflection';
 
 class DummyDirective extends Directive {
-  constructor({lifecycle = []} = {}) { super({lifecycle: lifecycle}); }
+  constructor({lifecycle} = {}) { super({lifecycle: lifecycle}); }
 }
 
 @proxy