Fix the script analyzer/tool/generate_files

pkg/analyzer/lib/src/summary/format.dart

 // Copyright (c) 2015, 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.
 //
 // This file has been automatically generated.  Please do not edit it manually.
 // To regenerate the file, use the script "pkg/analyzer/tool/generate_files".
 
 library analyzer.src.summary.format;
 
 import 'dart:convert' as convert;
 
-import 'package:front_end/src/base/api_signature.dart' as api_sig;
-import 'package:front_end/src/base/flat_buffers.dart' as fb;
+import 'package:analyzer/src/summary/api_signature.dart' as api_sig;
+import 'package:analyzer/src/summary/flat_buffers.dart' as fb;
 
 import 'idl.dart' as idl;
 
 class _EntityRefKindReader extends fb.Reader<idl.EntityRefKind> {
   const _EntityRefKindReader() : super();
 
   @override
   int get size => 1;
 
   @override
@@ skipping 12613 matching lines @@
         "isStatic": isStatic,
         "name": name,
         "nameOffset": nameOffset,
         "propagatedTypeSlot": propagatedTypeSlot,
         "type": type,
       };
 
   @override
   String toString() => convert.JSON.encode(toJson());
 }