All strong mode cleaning of dart2js.

tests/compiler/dart2js/deferred_load_graph_segmentation_test.dart

Index: tests/compiler/dart2js/deferred_load_graph_segmentation_test.dart
diff --git a/tests/compiler/dart2js/deferred_load_graph_segmentation_test.dart b/tests/compiler/dart2js/deferred_load_graph_segmentation_test.dart
index 3bf8b7bc5f78fd68abf3dace7be6e92949726181..5a7c3cec570f5fb52fc669f6eb06eb8a96b5db84 100644
--- a/tests/compiler/dart2js/deferred_load_graph_segmentation_test.dart
+++ b/tests/compiler/dart2js/deferred_load_graph_segmentation_test.dart
@@ -31,13 +31,13 @@ void main() {
     var backend = compiler.backend;
     var classes = backend.emitter.neededClasses;
     var inputElement = classes.where((e) => e.name == 'InputElement').single;
-    var lib1 = lookupLibrary("memory:lib1.dart");
+    dynamic lib1 = lookupLibrary("memory:lib1.dart");
     var foo1 = lib1.find("foo1");
-    var lib2 = lookupLibrary("memory:lib2.dart");
+    dynamic lib2 = lookupLibrary("memory:lib2.dart");
     var foo2 = lib2.find("foo2");
-    var lib3 = lookupLibrary("memory:lib3.dart");
+    dynamic lib3 = lookupLibrary("memory:lib3.dart");
     var foo3 = lib3.find("foo3");
-    var lib4 = lookupLibrary("memory:lib4.dart");
+    dynamic lib4 = lookupLibrary("memory:lib4.dart");
     var bar1 = lib4.find("bar1");
     var bar2 = lib4.find("bar2");