Move scope.dart.

pkg/front_end/lib/src/fasta/builder/constructor_reference_builder.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.constructor_reference_builder;
 
-import 'builder.dart' show PrefixBuilder, ClassBuilder, Builder, TypeBuilder;
+import 'builder.dart'
+    show Builder, ClassBuilder, PrefixBuilder, Scope, TypeBuilder;
 
 import '../messages.dart' show warning;
 
-import 'scope.dart' show Scope;
-
 class ConstructorReferenceBuilder extends Builder {
   final String name;
 
   final List<TypeBuilder> typeArguments;
 
   /// This is the name of a named constructor. As `bar` in `new Foo<T>.bar()`.
   final String suffix;
 
   Builder target;
 
@@ skipping 25 matching lines @@
       }
     }
     if (builder is ClassBuilder) {
       target = builder.constructors[suffix ?? ""];
     }
     if (target == null) {
       warning(null, -1, "Couldn't find constructor '$fullNameForErrors'.");
     }
   }
 }