All strong mode cleaning of dart2js.

tests/compiler/dart2js/deferred_follow_constant_dependencies_test.dart

Index: tests/compiler/dart2js/deferred_follow_constant_dependencies_test.dart
diff --git a/tests/compiler/dart2js/deferred_follow_constant_dependencies_test.dart b/tests/compiler/dart2js/deferred_follow_constant_dependencies_test.dart
index c0eeba9a28e5df8d2ce334ecfda957694e6c9a69..718574a080b9c5026964c91dd8f465e3b32cfb49 100644
--- a/tests/compiler/dart2js/deferred_follow_constant_dependencies_test.dart
+++ b/tests/compiler/dart2js/deferred_follow_constant_dependencies_test.dart
@@ -5,7 +5,6 @@
 // Test that constants depended on by other constants are correctly deferred.
 
 import 'package:async_helper/async_helper.dart';
-import 'package:compiler/src/common.dart';
 import 'package:compiler/src/constants/values.dart';
 import 'package:compiler/src/compiler.dart';
 import 'package:expect/expect.dart';
@@ -25,11 +24,11 @@ void main() {
       c.getDependencies().forEach(addConstantWithDependendencies);
     }
 
-    var codegenWorldBuilder = compiler.codegenWorldBuilder;
+    dynamic codegenWorldBuilder = compiler.codegenWorldBuilder;
     codegenWorldBuilder.compiledConstants
         .forEach(addConstantWithDependendencies);
     for (String stringValue in ["cA", "cB", "cC"]) {
-      ConstantValue constant = allConstants.firstWhere((constant) {
+      ConstantValue constant = allConstants.firstWhere((dynamic constant) {
         return constant.isString && constant.primitiveValue == stringValue;
       });
       Expect.notEquals(null, outputUnitForConstant(constant),