Remove package imports from itself.

pkg/front_end/lib/src/fasta/source/diet_parser.dart

Index: pkg/front_end/lib/src/fasta/source/diet_parser.dart
diff --git a/pkg/front_end/lib/src/fasta/source/diet_parser.dart b/pkg/front_end/lib/src/fasta/source/diet_parser.dart
index 6fc1c10b3d386f16b698ce759cbce298b367ff9f..8c142581387e3fc5d755fb34325977bf1e5767a7 100644
--- a/pkg/front_end/lib/src/fasta/source/diet_parser.dart
+++ b/pkg/front_end/lib/src/fasta/source/diet_parser.dart
@@ -4,17 +4,15 @@
 
 library fasta.diet_parser;
 
-import 'package:front_end/src/fasta/scanner/token.dart'
-    show BeginGroupToken, Token;
+import '../scanner/token.dart' show BeginGroupToken, Token;
 
-import 'package:front_end/src/fasta/parser/class_member_parser.dart'
-    show ClassMemberParser;
+import '../parser/class_member_parser.dart' show ClassMemberParser;
 
-import 'package:front_end/src/fasta/parser/error_kind.dart' show ErrorKind;
+import '../parser/error_kind.dart' show ErrorKind;
 
-import 'package:front_end/src/fasta/parser/listener.dart' show Listener;
+import '../parser/listener.dart' show Listener;
 
-import 'package:front_end/src/fasta/parser/parser.dart' show optional;
+import '../parser/parser.dart' show optional;
 
 // TODO(ahe): Move this to parser package.
 class DietParser extends ClassMemberParser {