Prepare for separate setter scope.

pkg/front_end/lib/src/fasta/source/source_class_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.source_class_builder;
 
 import 'package:kernel/ast.dart'
     show Class, Constructor, Supertype, TreeNode, setParents;
 
 import '../errors.dart' show internalError;
@@ skipping 24 matching lines @@
   cls.fileUri ??= relativizeUri(parent.fileUri);
   if (cls.fileOffset == TreeNode.noOffset) {
     cls.fileOffset = charOffset;
   }
   return cls;
 }
 
 class SourceClassBuilder extends KernelClassBuilder {
   final Class cls;
 
+  @override
   final Map<String, Builder> constructors;
 
   final Map<String, Builder> membersInScope;
 
   final List<ConstructorReferenceBuilder> constructorReferences;
 
   final KernelTypeBuilder mixedInType;
 
   SourceClassBuilder(
       List<MetadataBuilder> metadata,
@@ skipping 57 matching lines @@
           // TODO(ahe): Report an error if supertype is null.
           cls.implementedTypes.add(supertype);
         }
       }
     }
 
     cls.procedures.sort(compareProcedures);
     return cls;
   }
 
-  Builder findConstructorOrFactory(String name) => constructors[name];
-
   void addSyntheticConstructor(Constructor constructor) {
     String name = constructor.name.name;
     cls.constructors.add(constructor);
     constructor.parent = cls;
     DillMemberBuilder memberBuilder = new DillMemberBuilder(constructor, this);
     memberBuilder.next = constructors[name];
     constructors[name] = memberBuilder;
   }
 }
 
@@ skipping 11 matching lines @@
 Map<String, Builder> computeConstructors(Map<String, Builder> members) {
   Map<String, Builder> constructors = <String, Builder>{};
   members.forEach((String name, Builder builder) {
     if (builder is ProcedureBuilder &&
         (builder.isConstructor || builder.isFactory)) {
       constructors[name] = builder;
     }
   });
   return constructors;
 }