pkg/compiler: clean up imports

pkg/compiler/lib/src/deferred_load.dart

 // Copyright (c) 2014, 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 deferred_load;
 
 import 'common/backend_api.dart' show Backend;
 import 'common/tasks.dart' show CompilerTask;
 import 'common.dart';
 import 'compiler.dart' show Compiler;
-import 'constants/expressions.dart'
-    show ConstantExpression, ConstantExpressionKind;
+import 'constants/expressions.dart' show ConstantExpression;
 import 'constants/values.dart'
     show
         ConstantValue,
         ConstructedConstantValue,
         DeferredConstantValue,
         StringConstantValue;
 import 'dart_types.dart';
 import 'elements/elements.dart'
     show
         AccessorElement,
@@ skipping 1010 matching lines @@
 
   bool operator ==(other) {
     if (other is! _DeclaredDeferredImport) return false;
     return declaration == other.declaration;
   }
 
   int get hashCode => declaration.hashCode * 17;
 
   String toString() => '$declaration';
 }