chore(transformers): remove reflector parameter from initReflector signature

Remove reflector parameter from initReflector method to simplify ng_deps for reflection
initialization. It wasn't used and was added for testability, but wasn't used. This
keeps the interface simplier.

modules/angular2/test/transform/directive_processor/expected/hello.ng_deps.dart

@@ -1,14 +1,15 @@
 library examples.src.hello_world.index_common_dart.ng_deps.dart;
 
 import 'hello.dart';
+import 'package:angular2/src/reflection/reflection.dart' as _ngRef;
 import 'package:angular2/angular2.dart'
     show bootstrap, Component, Directive, View, NgElement;
 
 var _visited = false;
-void initReflector(reflector) {
+void initReflector() {
   if (_visited) return;
   _visited = true;
-  reflector
+  _ngRef.reflector
     ..registerType(HelloCmp, {
       'factory': () => new HelloCmp(),
       'parameters': const [],