Revert "Towards compiling Hello World!" and "Compile and run Hello World!"

tests/compiler/dart2js/type_representation_test.dart

Index: tests/compiler/dart2js/type_representation_test.dart
diff --git a/tests/compiler/dart2js/type_representation_test.dart b/tests/compiler/dart2js/type_representation_test.dart
index e577d18e9f079fdb0d8c0df2779b1738879e9946..0a345a6b06873f3c61592df08b07f048031151a9 100644
--- a/tests/compiler/dart2js/type_representation_test.dart
+++ b/tests/compiler/dart2js/type_representation_test.dart
@@ -46,7 +46,14 @@ void testTypeRepresentations() {
       """).then((env) {
         var closedWorldRefiner = env.compiler.closeResolution();
         var closedWorld = closedWorldRefiner.closedWorld;
-        env.compiler.startCodegen(closedWorld);
+        env.compiler.enqueuer.createCodegenEnqueuer(closedWorld);
+        env.compiler.backend.onCodegenStart(
+            closedWorld,
+            new ElementCodegenWorldBuilderImpl(
+                closedWorld.elementEnvironment,
+                env.compiler.backend.nativeBasicData,
+                closedWorld,
+                const TypeMaskStrategy()));
         TypeRepresentationGenerator typeRepresentation =
             new TypeRepresentationGenerator(env.compiler.backend.namer);