Pay some naming debt.

pkg/front_end/lib/src/fasta/kernel/kernel_named_type_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.kernel_interface_type_builder;
 
 import 'package:kernel/ast.dart' show
     DartType,
     DynamicType,
     Supertype,
     VoidType;
 
 import '../errors.dart' show
     inputError;
 
 import 'kernel_builder.dart' show
-    InterfaceTypeBuilder,
     KernelClassBuilder,
     KernelInvalidTypeBuilder,
     KernelTypeBuilder,
+    NamedTypeBuilder,
     TypeBuilder,
     TypeDeclarationBuilder,
     TypeVariableBuilder;
 
-// TODO(ahe): This isn't really an interface type. Find better name, for
-// example, KernelNamedTypeBuilder.
-class KernelInterfaceTypeBuilder extends InterfaceTypeBuilder<KernelTypeBuilder>
+class KernelNamedTypeBuilder extends NamedTypeBuilder<KernelTypeBuilder>
     implements KernelTypeBuilder {
   TypeDeclarationBuilder<KernelTypeBuilder, DartType> builder;
 
-  KernelInterfaceTypeBuilder(String name, List<KernelTypeBuilder> arguments)
+  KernelNamedTypeBuilder(String name, List<KernelTypeBuilder> arguments)
       : super(name, arguments);
 
   KernelInvalidTypeBuilder buildInvalidType(String name) {
     // TODO(ahe): Report error somewhere.
     print("Type not found: $name");
     return new KernelInvalidTypeBuilder(name, null);
   }
 
   DartType handleMissingType() {
     // TODO(ahe): Fix this.
@@ skipping 36 matching lines @@
       int i = 0;
       for (KernelTypeBuilder argument in this.arguments) {
         KernelTypeBuilder type = argument.subst(substitution);
         if (type != argument) {
           arguments ??= this.arguments.toList();
           arguments[i] = type;
         }
         i++;
       }
       if (arguments != null) {
-        return new KernelInterfaceTypeBuilder(name, arguments)
+        return new KernelNamedTypeBuilder(name, arguments)
             ..builder = builder;
       }
     }
     return this;
   }
 }