Merge two constants.dart into one.

pkg/analysis_server/test/search/abstract_search_domain.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.search.abstract_search_domain;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/computer/element.dart';
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analysis_server/src/search/search_domain.dart';
 import 'package:analysis_server/src/search/search_result.dart';
-import 'package:analysis_server/src/services/constants.dart';
 import 'package:analysis_server/src/services/index/index.dart' show Index;
 import 'package:analysis_server/src/services/index/local_memory_index.dart';
 import 'package:unittest/unittest.dart';
 
 import '../analysis_abstract.dart';
 
 
 class AbstractSearchDomainTest extends AbstractAnalysisTest {
   String searchId;
   bool searchDone = false;
@@ skipping 69 matching lines @@
     handler = new SearchDomainHandler(server);
   }
 
   Future waitForSearchResults() {
     if (searchDone) {
       return new Future.value();
     }
     return new Future.delayed(Duration.ZERO, waitForSearchResults);
   }
 }