Fix the test to remove extra hint.

pkg/analyzer/lib/src/task/dart.dart

 // Copyright (c) 2015, 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 analyzer.src.task.dart;
 
 import 'dart:collection';
 import 'dart:math' as math;
 
 import 'package:analyzer/src/context/cache.dart';
@@ skipping 2365 matching lines @@
       'GenerateHintsTask', createTask, buildInputs, <ResultDescriptor>[HINTS]);
 
   GenerateHintsTask(InternalAnalysisContext context, AnalysisTarget target)
       : super(context, target);
 
   @override
   TaskDescriptor get descriptor => DESCRIPTOR;
 
   @override
   void internalPerform() {
+    AnalysisOptions analysisOptions = context.analysisOptions;
+    if (!analysisOptions.hint) {
+      outputs[HINTS] = AnalysisError.NO_ERRORS;
+      return;
+    }
+    //
+    // Prepare collectors.
+    //
     RecordingErrorListener errorListener = new RecordingErrorListener();
     Source source = getRequiredSource();
     ErrorReporter errorReporter = new ErrorReporter(errorListener, source);
     //
     // Prepare inputs.
     //
     CompilationUnit unit = getRequiredInput(RESOLVED_UNIT_INPUT);
     List<UsedImportedElements> usedImportedElementsList =
         getRequiredInput(USED_IMPORTED_ELEMENTS_INPUT);
     List<UsedLocalElements> usedLocalElementsList =
@@ skipping 14 matching lines @@
     }
     // Unused local elements.
     {
       UsedLocalElements usedElements =
           new UsedLocalElements.merge(usedLocalElementsList);
       UnusedLocalElementsVerifier visitor =
           new UnusedLocalElementsVerifier(errorListener, usedElements);
       unitElement.accept(visitor);
     }
     // Dart2js analysis.
-    if (context.analysisOptions.dart2jsHint) {
+    if (analysisOptions.dart2jsHint) {
       unit.accept(new Dart2JSVerifier(errorReporter));
     }
     // Dart best practices.
     InheritanceManager inheritanceManager =
         new InheritanceManager(libraryElement);
     TypeProvider typeProvider = getRequiredInput(TYPE_PROVIDER_INPUT);
     unit.accept(new BestPracticesVerifier(errorReporter, typeProvider));
     unit.accept(new OverrideVerifier(errorReporter, inheritanceManager));
     // Find to-do comments.
     new ToDoFinder(errorReporter).findIn(unit);
@@ skipping 978 matching lines @@
   @override
   bool moveNext() {
     if (_newSources.isEmpty) {
       return false;
     }
     currentTarget = _newSources.first;
     _newSources.remove(currentTarget);
     return true;
   }
 }