All strong mode cleaning of dart2js.

tests/compiler/dart2js/equivalence/check_helpers.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.
 
 /// General equivalence test functions.
 
 library dart2js.equivalence.helpers;
 
 import 'package:compiler/src/constants/expressions.dart';
 import 'package:compiler/src/constants/values.dart';
@@ skipping 37 matching lines @@
     return sb.toString();
   }
 }
 
 /// Strategy for checking equivalence.
 ///
 /// Use this strategy to fail early with contextual information in the event of
 /// inequivalence.
 class CheckStrategy extends TestStrategy {
   const CheckStrategy(
-      {Equivalence<Entity> elementEquivalence: areElementsEquivalent,
+      {Equivalence<Entity> elementEquivalence: areEntitiesEquivalent,
       Equivalence<DartType> typeEquivalence: areTypesEquivalent,
       Equivalence<ConstantExpression> constantEquivalence:
           areConstantsEquivalent,
       Equivalence<ConstantValue> constantValueEquivalence:
           areConstantValuesEquivalent})
       : super(
             elementEquivalence: elementEquivalence,
             typeEquivalence: typeEquivalence,
             constantEquivalence: constantEquivalence,
             constantValueEquivalence: constantValueEquivalence);
@@ skipping 407 matching lines @@
         (mismatch.isNotEmpty && failOnMismatch) ||
         remaining.isNotEmpty) {
       Expect.fail(message);
     } else {
       print(message);
     }
   } else if (verbose) {
     print(message);
   }
 }