Revert "Move dart2jslib parts into separate libraries."

pkg/compiler/lib/src/elements/elements.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 elements;
 
 import '../constants/constructors.dart';
 import '../constants/expressions.dart';
-import '../dart_types.dart';
-import '../dart2jslib.dart' show
-    Backend,
-    Compiler,
-    isPrivateName,
-    SourceSpan;
-import '../diagnostic_listener.dart';
-import '../messages.dart' show MessageKind;
-import '../resolution/resolution.dart';
-import '../ordered_typeset.dart' show OrderedTypeSet;
-import '../scanner/scannerlib.dart' show
-    Token,
-    isUserDefinableOperator,
-    isMinusOperator;
-import '../script.dart';
 import '../tree/tree.dart';
 import '../util/util.dart';
+import '../resolution/resolution.dart';
+
+import '../dart2jslib.dart' show InterfaceType,
+                                 DartType,
+                                 TypeVariableType,
+                                 TypedefType,
+                                 DualKind,
+                                 MessageKind,
+                                 DiagnosticListener,
+                                 Script,
+                                 FunctionType,
+                                 Selector,
+                                 SourceSpan,
+                                 Constant,
+                                 Compiler,
+                                 Backend,
+                                 isPrivateName;
+
+import '../dart_types.dart';
+
+import '../scanner/scannerlib.dart' show Token,
+                                         isUserDefinableOperator,
+                                         isMinusOperator;
+
+import '../ordered_typeset.dart' show OrderedTypeSet;
 
 import 'visitor.dart' show ElementVisitor;
 
 part 'names.dart';
 
 const int STATE_NOT_STARTED = 0;
 const int STATE_STARTED = 1;
 const int STATE_DONE = 2;
 
 class ElementCategory {
@@ skipping 1610 matching lines @@
   bool get isDeclaredByField;
 
   /// Returns `true` if this member is abstract.
   bool get isAbstract;
 
   /// If abstract, [implementation] points to the overridden concrete member,
   /// if any. Otherwise [implementation] points to the member itself.
   Member get implementation;
 }