Remove dart2jslib.dart

pkg/compiler/lib/src/js/rewrite_async.dart

Index: pkg/compiler/lib/src/js/rewrite_async.dart
diff --git a/pkg/compiler/lib/src/js/rewrite_async.dart b/pkg/compiler/lib/src/js/rewrite_async.dart
index b6c909714fe87a5db089b53623843d32bc95b727..b2d0eb7a2bfaa43660daa2e1bcf7b613f6dedef1 100644
--- a/pkg/compiler/lib/src/js/rewrite_async.dart
+++ b/pkg/compiler/lib/src/js/rewrite_async.dart
@@ -13,7 +13,11 @@ import 'package:js_runtime/shared/async_await_error_codes.dart'
 import "js.dart" as js;
 
 import '../diagnostic_listener.dart';
-import '../util/util.dart';
+import '../diagnostics/spannable.dart' show
+    NO_LOCATION_SPANNABLE,
+    Spannable;
+import '../util/util.dart' show
+    Pair;
 
 /// Rewrites a [js.Fun] with async/sync*/async* functions and await and yield
 /// (with dart-like semantics) to an equivalent function without these.