Fix 'Unused local variable' hints in analyzer and analysis_server.

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.
 
 library test.domain.completion;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/domain_completion.dart';
@@ skipping 69 matching lines @@
   @override
   Index createIndex() {
     return createLocalMemoryIndex();
   }
 
   Future getSuggestions() {
     return waitForTasksFinished().then((_) {
       Request request =
           new CompletionGetSuggestionsParams(testFile, completionOffset).toRequest('0');
       Response response = handleSuccessfulRequest(request);
-      var result = new CompletionGetSuggestionsResult.fromResponse(response);
       completionId = response.id;
       assertValidId(completionId);
       return pumpEventQueue().then((_) {
         expect(suggestionsDone, isTrue);
       });
     });
   }
 
   void processNotification(Notification notification) {
     if (notification.event == COMPLETION_RESULTS) {
@@ skipping 104 matching lines @@
     ''');
     return getSuggestions().then((_) {
       expect(replacementOffset, equals(completionOffset - 3));
       expect(replacementLength, equals(4));
       assertHasResult(CompletionSuggestionKind.INVOCATION, 'Object');
       assertHasResult(CompletionSuggestionKind.INVOCATION, 'test');
       assertNoResult('HtmlElement');
     });
   }
 }