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

pkg/compiler/lib/src/js_model/js_strategy.dart

Index: pkg/compiler/lib/src/js_model/js_strategy.dart
diff --git a/pkg/compiler/lib/src/js_model/js_strategy.dart b/pkg/compiler/lib/src/js_model/js_strategy.dart
index 0a95500adf78ad7b69feaa5ce47343a804dc55e5..4173eaf4711c77704f5e4d64c0fb141b44c68c0f 100644
--- a/pkg/compiler/lib/src/js_model/js_strategy.dart
+++ b/pkg/compiler/lib/src/js_model/js_strategy.dart
@@ -19,7 +19,6 @@ import '../js_backend/backend_usage.dart';
 import '../js_backend/constant_system_javascript.dart';
 import '../js_backend/interceptor_data.dart';
 import '../js_backend/native_data.dart';
-import '../kernel/kernel_strategy.dart';
 import '../kernel/kernel_backend_strategy.dart';
 import '../ssa/ssa.dart';
 import '../universe/class_set.dart';
@@ -134,12 +133,7 @@ class JsBackendStrategy implements BackendStrategy {
       NativeBasicData nativeBasicData,
       ClosedWorld closedWorld,
       SelectorConstraintsStrategy selectorConstraintsStrategy) {
-    KernelFrontEndStrategy frontendStrategy = _compiler.frontendStrategy;
-    return new KernelCodegenWorldBuilder(
-        frontendStrategy.elementMap,
-        closedWorld.elementEnvironment,
-        nativeBasicData,
-        closedWorld,
-        selectorConstraintsStrategy);
+    return new KernelCodegenWorldBuilder(closedWorld.elementEnvironment,
+        nativeBasicData, closedWorld, selectorConstraintsStrategy);
   }
 }