chore(build): replace traceur-runtime with es6-shim.

This removes traceur as a dependency for the t push -f
angular2 build.

Closes #4148

tools/broccoli/html-replace/SCRIPTS.html

@@ -1,6 +1,6 @@
 <script src="zone-microtask.js" type="text/javascript"></script>
 <script src="long-stack-trace-zone.js" type="text/javascript"></script>
-<script src="traceur-runtime.js" type="text/javascript"></script>
+<script src="es6-shim.js" type="text/javascript"></script>
 <script src="system.src.js" type="text/javascript"></script>
 <script src="Reflect.js" type="text/javascript"></script>
 <script type="text/javascript">

tools/broccoli/html-replace/SCRIPTS_benchmarks.html

@@ -1,7 +1,7 @@
 <script src="zone-microtask.js" type="text/javascript"></script>
 <script src="long-stack-trace-zone.js" type="text/javascript"></script>
 <script src="url_params_to_form.js" type="text/javascript"></script>
-<script src="traceur-runtime.js" type="text/javascript"></script>
+<script src="es6-shim.js" type="text/javascript"></script>
 <script src="system.src.js" type="text/javascript"></script>
 <script src="Reflect.js" type="text/javascript"></script>
 <script type="text/javascript">

tools/broccoli/html-replace/SCRIPTS_benchmarks_external.html

@@ -2,7 +2,7 @@
 <script src="long-stack-trace-zone.js" type="text/javascript"></script>
 <script src="angular.js" type="text/javascript"></script>
 <script src="url_params_to_form.js" type="text/javascript"></script>
-<script src="traceur-runtime.js" type="text/javascript"></script>
+<script src="es6-shim.js" type="text/javascript"></script>
 <script src="system.src.js" type="text/javascript"></script>
 <script src="Reflect.js" type="text/javascript"></script>
 <script type="text/javascript">