Remove dart2jslib.dart

pkg/compiler/lib/src/world.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.world;
 
 import 'closure.dart' show
     SynthesizedCallMethodElementX;
-import 'dart2jslib.dart' show
+import 'common/backend_api.dart' show
+    Backend;
+import 'common/registry.dart' show
+    Registry;
+import 'compiler.dart' show
     invariant,
     Backend,
     Compiler,
     Registry;
 import 'dart_types.dart';
+import 'diagnostics/invariant.dart' show
+    invariant;
 import 'elements/elements.dart' show
     ClassElement,
     Element,
     FunctionElement,
     MixinApplicationElement,
     TypedefElement,
     VariableElement;
 import 'ordered_typeset.dart';
 import 'types/types.dart' as ti;
 import 'universe/universe.dart' show
@@ skipping 552 matching lines @@
     // function expressions's element.
     // TODO(herhut): Generate classes for function expressions earlier.
     if (element is SynthesizedCallMethodElementX) {
       return getMightBePassedToApply(element.expression);
     }
     return functionsThatMightBePassedToApply.contains(element);
   }
 
   bool get hasClosedWorldAssumption => !compiler.hasIncrementalSupport;
 }