Get rid of promotedType=none annotations

pkg/analyzer/test/src/task/strong/front_end_inference_test.dart

 // Copyright (c) 2017, 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 'dart:convert';
 import 'dart:io';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
@@ skipping 307 matching lines @@
     _recordMethodTarget(node.operator.charOffset, node.staticElement);
   }
 
   visitSimpleIdentifier(SimpleIdentifier node) {
     super.visitSimpleIdentifier(node);
     Element element = node.staticElement;
     void recordPromotions(DartType elementType) {
       if (node.inGetterContext() && !node.inDeclarationContext()) {
         int offset = node.offset;
         DartType type = node.staticType;
-        if (identical(type, elementType)) {
-          _instrumentation.record(uri, offset, 'promotedType',
-              const fasta.InstrumentationValueLiteral('none'));
-        } else {
+        if (!identical(type, elementType)) {
           _instrumentation.record(uri, offset, 'promotedType',
               new _InstrumentationValueForType(type));
         }
       }
     }
 
     if (element is LocalVariableElement) {
       recordPromotions(element.type);
     } else if (element is ParameterElement) {
       recordPromotions(element.type);
@@ skipping 51 matching lines @@
 
   /// Based on DDC code generator's `_recoverTypeArguments`
   Iterable<DartType> _recoverTypeArguments(FunctionType g, FunctionType f) {
     assert(identical(g.element, f.element));
     assert(g.typeFormals.isNotEmpty && f.typeFormals.isEmpty);
     assert(g.typeFormals.length + g.typeArguments.length ==
         f.typeArguments.length);
     return f.typeArguments.skip(g.typeArguments.length);
   }
 }