Strong mode cleaning of many dart2js tests.

tests/compiler/dart2js/kernel/closed_world2_test.dart

Index: tests/compiler/dart2js/kernel/closed_world2_test.dart
diff --git a/tests/compiler/dart2js/kernel/closed_world2_test.dart b/tests/compiler/dart2js/kernel/closed_world2_test.dart
index 7ea0ad9f6a683b126726910e258ef29f926ad528..482f354fd2c52015258b32367f5c593cdcb0088d 100644
--- a/tests/compiler/dart2js/kernel/closed_world2_test.dart
+++ b/tests/compiler/dart2js/kernel/closed_world2_test.dart
@@ -148,10 +148,12 @@ Future<ResultKind> mainInternal(List<String> args,
   checkBackendUsage(backendUsage1, backendUsage2, strategy);
 
   checkResolutionEnqueuers(backendUsage1, backendUsage2, enqueuer1, enqueuer2,
-      elementEquivalence: equivalence.entityEquivalence,
+      elementEquivalence: (a, b) => equivalence.entityEquivalence(a, b),
       typeEquivalence: (ResolutionDartType a, DartType b) {
-    return equivalence.typeEquivalence(unalias(a), b);
-  }, elementFilter: elementFilter, verbose: arguments.verbose);
+        return equivalence.typeEquivalence(unalias(a), b);
+      },
+      elementFilter: elementFilter,
+      verbose: arguments.verbose);
 
   checkClosedWorlds(closedWorld1, closedWorld2,
       strategy: equivalence.defaultStrategy, verbose: arguments.verbose);