Revert "Extract invoke-main stub generator."

pkg/compiler/lib/src/js_emitter/model.dart

Index: pkg/compiler/lib/src/js_emitter/model.dart
diff --git a/pkg/compiler/lib/src/js_emitter/model.dart b/pkg/compiler/lib/src/js_emitter/model.dart
index 333ef2a8ec9f1c0da576b3c99d166389084a7607..313fb8056947c5bc99d452c9945142936965b6ac 100644
--- a/pkg/compiler/lib/src/js_emitter/model.dart
+++ b/pkg/compiler/lib/src/js_emitter/model.dart
@@ -4,7 +4,7 @@
 
 library dart2js.new_js_emitter.model;
 
-import '../js/js.dart' as js show Expression, Statement;
+import '../js/js.dart' as js show Expression;
 import '../constants/values.dart' show ConstantValue;
 
 import '../deferred_load.dart' show OutputUnit;
@@ -103,12 +103,12 @@ abstract class Fragment {
  * other [DeferredFragment]s.
  */
 class MainFragment extends Fragment {
-  final js.Statement invokeMain;
+  final js.Expression main;
   final List<Holder> holders;
 
   MainFragment(OutputUnit outputUnit,
                String outputFileName,
-               this.invokeMain,
+               this.main,
                List<Library> libraries,
                List<StaticField> staticNonFinalFields,
                List<StaticField> staticLazilyInitializedFields,