Revert "Move dart2jslib parts into separate libraries."

pkg/compiler/lib/src/native/native.dart

Index: pkg/compiler/lib/src/native/native.dart
diff --git a/pkg/compiler/lib/src/native/native.dart b/pkg/compiler/lib/src/native/native.dart
index 3ffffb5c07190c99e8edd63f58264f4f5d233220..4a32a526d8afd73f342e990c50fce04416fdfc36 100644
--- a/pkg/compiler/lib/src/native/native.dart
+++ b/pkg/compiler/lib/src/native/native.dart
@@ -9,20 +9,12 @@ import 'dart:collection' show Queue;
 import '../constants/values.dart';
 import '../dart2jslib.dart';
 import '../dart_types.dart';
-import '../diagnostic_listener.dart';
-import '../enqueue.dart' show
-    Enqueuer,
-    ResolutionEnqueuer;
 import '../elements/elements.dart';
-import '../elements/modelx.dart' show
-    BaseClassElementX,
-    ElementX,
-    FunctionElementX,
-    LibraryElementX;
+import '../elements/modelx.dart'
+    show ElementX, BaseClassElementX, FunctionElementX, LibraryElementX;
 import '../js/js.dart' as js;
 import '../js_backend/js_backend.dart';
 import '../js_emitter/js_emitter.dart' show CodeEmitterTask, NativeEmitter;
-import '../messages.dart' show MessageKind;
 import '../resolution/resolution.dart' show ResolverVisitor;
 import '../scanner/scannerlib.dart';
 import '../ssa/ssa.dart';