Strong mode cleaning of many dart2js tests.

tests/compiler/dart2js/reexport_handled_test.dart

Index: tests/compiler/dart2js/reexport_handled_test.dart
diff --git a/tests/compiler/dart2js/reexport_handled_test.dart b/tests/compiler/dart2js/reexport_handled_test.dart
index 8a7c6f798ef49b38e6cd1062529bfccd23ba481b..b153fe81e0aaa9180fed75fda12102ed46750240 100644
--- a/tests/compiler/dart2js/reexport_handled_test.dart
+++ b/tests/compiler/dart2js/reexport_handled_test.dart
@@ -7,8 +7,6 @@ library reexport_handled_test;
 import "package:expect/expect.dart";
 import "package:async_helper/async_helper.dart";
 import 'mock_compiler.dart';
-import 'package:compiler/src/elements/elements.dart'
-    show Element, LibraryElement;
 
 final exportingLibraryUri = Uri.parse('exporting.dart');
 const String EXPORTING_LIBRARY_SOURCE = '''
@@ -40,7 +38,7 @@ void main() {
 
         // Load reexporting library when exports are handled on the exporting library.
         return compiler.libraryLoader.loadLibrary(reexportingLibraryUri);
-      }).then((loadedLibraries) {
+      }).then((dynamic loadedLibraries) {
         compiler.processLoadedLibraries(loadedLibraries);
         var foo = loadedLibraries.rootLibrary.findExported('foo');
         Expect.isNotNull(foo);