Move scope.dart.

pkg/front_end/lib/src/fasta/scope.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.scope;
 
-import 'builder.dart' show Builder, MixedAccessor;
+import 'builder/builder.dart' show Builder, MixedAccessor;
 
-import '../errors.dart' show internalError;
+import 'errors.dart' show internalError;
 
 class Scope {
   /// Names declared in this scope.
   final Map<String, Builder> local;
 
   /// The scope that this scope is nested within, or `null` if this is the top
   /// level scope.
   final Scope parent;
 
   /// Indicates whether an attempt to declare new names in this scope should
@@ skipping 161 matching lines @@
 
   String get message => "Access error: '$name'.";
 }
 
 class AmbiguousBuilder extends ProblemBuilder {
   AmbiguousBuilder(String name, Builder builder, int charOffset, Uri fileUri)
       : super(name, builder, charOffset, fileUri);
 
   String get message => "Duplicated named: '$name'.";
 }