Remove package imports from itself.

pkg/front_end/lib/src/fasta/scanner/bin/scanner.dart

Index: pkg/front_end/lib/src/fasta/scanner/bin/scanner.dart
diff --git a/pkg/front_end/lib/src/fasta/scanner/bin/scanner.dart b/pkg/front_end/lib/src/fasta/scanner/bin/scanner.dart
index 4d46811eaab02862b637c68911248389ee338172..f31c42f6b8c0f0f5b88c9be0826028563d0fe485 100644
--- a/pkg/front_end/lib/src/fasta/scanner/bin/scanner.dart
+++ b/pkg/front_end/lib/src/fasta/scanner/bin/scanner.dart
@@ -2,6 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE.md file.
 
-import 'package:front_end/src/fasta/scanner/main.dart' as dart_scanner;
+import '../main.dart' as dart_scanner;
 
 main(List<String> arguments) => dart_scanner.main(arguments);