Remove package imports from itself.

pkg/front_end/lib/src/fasta/parser/main.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library fasta.parser.main;
 
 import 'dart:convert' show LineSplitter, UTF8;
 
 import 'dart:io' show File;
 
-import 'package:front_end/src/fasta/scanner/token.dart' show Token;
+import '../scanner/token.dart' show Token;
 
-import 'package:front_end/src/fasta/scanner/io.dart' show readBytesFromFileSync;
+import '../scanner/io.dart' show readBytesFromFileSync;
 
-import 'package:front_end/src/fasta/scanner.dart' show scan;
+import '../scanner.dart' show scan;
 
 import 'listener.dart' show Listener;
 
 import 'top_level_parser.dart' show TopLevelParser;
 
 import 'identifier_context.dart' show IdentifierContext;
 
 class DebugListener extends Listener {
   void handleIdentifier(Token token, IdentifierContext context) {
     logEvent("Identifier: ${token.value}");
@@ skipping 17 matching lines @@
     } else {
       outLine(Uri.base.resolve(argument));
     }
   }
 }
 
 void outLine(Uri uri) {
   new TopLevelParser(new DebugListener())
       .parseUnit(scan(readBytesFromFileSync(uri)).tokens);
 }