Remove dart2jslib.dart

pkg/compiler/lib/src/compile_time_constants.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library dart2js.compile_time_constant_evaluator;
 
+import 'common/tasks.dart' show
+    CompilerTask;
+import 'compiler.dart' show
+    Compiler;
 import 'constant_system_dart.dart';
 import 'constants/constant_system.dart';
 import 'constants/evaluation.dart';
 import 'constants/expressions.dart';
 import 'constants/values.dart';
 import 'dart_types.dart';
-import 'dart2jslib.dart' show
-    Compiler,
-    CompilerTask,
+import 'diagnostics/invariant.dart' show
     invariant;
 import 'enqueue.dart' show
     WorldImpact;
 import 'elements/elements.dart';
 import 'elements/modelx.dart' show FunctionElementX;
 import 'messages.dart' show MessageKind;
 import 'resolution/resolution.dart';
 import 'resolution/operators.dart';
 import 'tree/tree.dart';
 import 'util/util.dart' show Link;
@@ skipping 1233 matching lines @@
 class _CompilerEnvironment implements Environment {
   final Compiler compiler;
 
   _CompilerEnvironment(this.compiler);
 
   @override
   String readFromEnvironment(String name) {
     return compiler.fromEnvironment(name);
   }
 }