dart2js cleanup: remove unused imports and variables

pkg/compiler/lib/src/io/start_end_information.dart

Index: pkg/compiler/lib/src/io/start_end_information.dart
diff --git a/pkg/compiler/lib/src/io/start_end_information.dart b/pkg/compiler/lib/src/io/start_end_information.dart
index b08477fdb340441f696de9cc833e6fff92b72f07..b1553cd0271345eed91032a376e03fa67bd03157 100644
--- a/pkg/compiler/lib/src/io/start_end_information.dart
+++ b/pkg/compiler/lib/src/io/start_end_information.dart
@@ -9,12 +9,11 @@ library dart2js.source_information.start_end;
 
 import '../common.dart';
 import '../diagnostics/messages.dart' show MessageTemplate;
-import '../elements/elements.dart' show AstElement, LocalElement;
+import '../elements/elements.dart' show AstElement;
 import '../js/js.dart' as js;
 import '../js/js_source_mapping.dart';
 import '../tokens/token.dart' show Token;
-import '../tree/tree.dart' show Node, Send;
-
+import '../tree/tree.dart' show Node;
 import 'source_file.dart';
 import 'source_information.dart';