final fields shouldn't be dependencies of const variables

pkg/analyzer/test/generated/constant_test.dart

 // Copyright (c) 2016, 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.test.constant_test;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
 import 'package:analyzer/src/dart/element/element.dart';
@@ skipping 2195 matching lines @@
   void setUp() {
     _referenceGraph = new DirectedGraph<ConstantEvaluationTarget>();
     _head = ElementFactory.topLevelVariableElement2("v1");
   }
 
   void test_visitSimpleIdentifier_const() {
     _visitNode(_makeTailVariable("v2", true));
     _assertOneArc(_tail);
   }
 
-  void test_visitSimpleIdentifier_nonConst() {
-    _visitNode(_makeTailVariable("v2", false));
-    _assertOneArc(_tail);
-  }
-
   void test_visitSuperConstructorInvocation_const() {
     _visitNode(_makeTailSuperConstructorInvocation("A", true));
     _assertOneArc(_tail);
   }
 
   void test_visitSuperConstructorInvocation_nonConst() {
     _visitNode(_makeTailSuperConstructorInvocation("A", false));
     _assertOneArc(_tail);
   }
 
@@ skipping 55 matching lines @@
 
   void _visitNode(AstNode node) {
     node.accept(_createReferenceFinder(_head));
   }
 }
 
 class _TestAnalysisContext extends TestAnalysisContext {
   @override
   InternalAnalysisContext getContextFor(Source source) => this;
 }