Implement canonical name scheme in kernel.

pkg/kernel/lib/transformations/empty.dart

 // Copyright (c) 2017, 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 kernel.transformations.empty;
 
 import '../ast.dart';
 import '../kernel.dart';
 import '../visitor.dart';
 
 Program transformProgram(Program program) {
   new EmptyTransformer().visitProgram(program);
   return program;
 }
 
-class EmptyTransformer extends Transformer {}
+class EmptyTransformer extends Transformer {}