Revert "Move dart2jslib parts into separate libraries."

tests/compiler/dart2js/type_checker_test.dart

Index: tests/compiler/dart2js/type_checker_test.dart
diff --git a/tests/compiler/dart2js/type_checker_test.dart b/tests/compiler/dart2js/type_checker_test.dart
index 46ae8a25021affe6f76b407d2f11caeca0355d9f..f6be4cf6c099034414136e5946b768cb575203e7 100644
--- a/tests/compiler/dart2js/type_checker_test.dart
+++ b/tests/compiler/dart2js/type_checker_test.dart
@@ -3,30 +3,22 @@
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:async';
-
 import 'package:async_helper/async_helper.dart';
 import 'package:expect/expect.dart';
-
-import 'package:compiler/src/dart_types.dart';
 import 'package:compiler/src/elements/elements.dart';
-import 'package:compiler/src/elements/modelx.dart' show
-    ClassElementX,
-    CompilationUnitElementX,
-    ElementX,
-    FunctionElementX;
-import 'package:compiler/src/messages.dart';
-import 'package:compiler/src/io/source_file.dart';
-import 'package:compiler/src/resolution/resolution.dart' show
-    TreeElements,
-    TreeElementMapping;
 import 'package:compiler/src/tree/tree.dart';
-import 'package:compiler/src/typechecker.dart';
-import 'package:compiler/src/script.dart';
 import 'package:compiler/src/util/util.dart';
-
+import 'package:compiler/src/io/source_file.dart';
 import 'mock_compiler.dart';
 import 'parser_helper.dart';
 
+import 'package:compiler/src/elements/modelx.dart'
+  show ClassElementX, CompilationUnitElementX, ElementX, FunctionElementX;
+
+import 'package:compiler/src/dart2jslib.dart';
+
+import 'package:compiler/src/dart_types.dart';
+
 final MessageKind NOT_ASSIGNABLE = MessageKind.NOT_ASSIGNABLE;
 final MessageKind MEMBER_NOT_FOUND = MessageKind.MEMBER_NOT_FOUND;