pkg/compiler: fix imports

pkg/compiler/lib/src/parser/diet_parser_task.dart

Index: pkg/compiler/lib/src/parser/diet_parser_task.dart
diff --git a/pkg/compiler/lib/src/parser/diet_parser_task.dart b/pkg/compiler/lib/src/parser/diet_parser_task.dart
index 3c48a31ef3a39ecad79500febaf66e505b9377bd..002bba0cddb28ed287bb66002b212a9fb55e3335 100644
--- a/pkg/compiler/lib/src/parser/diet_parser_task.dart
+++ b/pkg/compiler/lib/src/parser/diet_parser_task.dart
@@ -9,11 +9,10 @@ import '../common/backend_api.dart' show Backend;
 import '../common/tasks.dart' show CompilerTask, Measurer;
 import '../elements/elements.dart' show CompilationUnitElement;
 import '../id_generator.dart';
+import '../options.dart' show ParserOptions;
 import '../tokens/token.dart' show Token;
-
-import 'listener.dart' show ParserError;
 import 'element_listener.dart' show ElementListener, ScannerOptions;
-import '../options.dart' show ParserOptions;
+import 'listener.dart' show ParserError;
 import 'partial_parser.dart' show PartialParser;
 
 class DietParserTask extends CompilerTask {