Modify autocompletion test case to work with new feature added

pkg/analysis_server/test/domain_completion_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.
 
 import 'dart:async';
 
 import 'package:analysis_server/protocol/protocol.dart';
 import 'package:analysis_server/protocol/protocol_generated.dart';
 import 'package:analysis_server/src/plugin/plugin_manager.dart';
 import 'package:analysis_server/src/provisional/completion/completion_core.dart';
@@ skipping 687 matching lines @@
   }
 
   test_sentToPlugins() async {
     addTestFile('''
       void main() {
         ^
       }
     ''');
     PluginInfo info = new DiscoveredPluginInfo('a', 'b', 'c', null, null);
     plugin.CompletionGetSuggestionsResult result =
-        new plugin.CompletionGetSuggestionsResult(1, 2, <CompletionSuggestion>[
+        new plugin.CompletionGetSuggestionsResult(
+            testFile.indexOf('^'), 0, <CompletionSuggestion>[
       new CompletionSuggestion(CompletionSuggestionKind.IDENTIFIER,
           DART_RELEVANCE_DEFAULT, 'plugin completion', 3, 0, false, false)
     ]);
     pluginManager.broadcastResults = <PluginInfo, Future<plugin.Response>>{
       info: new Future.value(result.toResponse('-', 1))
     };
     await getSuggestions();
     assertHasResult(CompletionSuggestionKind.IDENTIFIER, 'plugin completion',
         selectionOffset: 3);
   }
@@ skipping 46 matching lines @@
 
   @override
   Future sort(
       CompletionRequest request, Iterable<CompletionSuggestion> suggestions) {
     if (!enabled) {
       throw 'unexpected sort';
     }
     return new Future.value();
   }
 }