Merge two constants.dart into one.

pkg/analysis_server/test/edit/refactoring_test.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 test.edit.refactoring;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/edit/edit_domain.dart';
 import 'package:analysis_server/src/protocol.dart';
-import 'package:analysis_server/src/services/constants.dart';
 import 'package:analysis_testing/reflective_tests.dart';
 import 'package:unittest/unittest.dart' hide ERROR;
 
 import '../analysis_abstract.dart';
 
 
 main() {
   groupSep = ' | ';
   runReflectiveTests(GetAvailableRefactoringsTest);
 }
@@ skipping 116 matching lines @@
 main() {
   // not an element
 }
 ''');
     return waitForTasksFinished().then((_) {
       List<String> kinds = getAvailableRefactorings('// not an element');
       expect(kinds, isNot(contains(RefactoringKind.RENAME)));
     });
   }
 }