dart2js: patch file support cleanup

pkg/compiler/lib/src/js_emitter/lazy_emitter/emitter.dart

 // Copyright (c) 2014, 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 dart2js.js_emitter.lazy_emitter;
 
 import 'package:js_runtime/shared/embedded_names.dart' show JsBuiltin;
 
 import '../../common.dart';
 import '../../compiler.dart' show Compiler;
 import '../../constants/values.dart' show ConstantValue;
 import '../../deferred_load.dart' show OutputUnit;
 import '../../elements/elements.dart'
     show ClassElement, Element, FieldElement, MethodElement;
 import '../../elements/entities.dart';
 import '../../js/js.dart' as js;
 import '../../js_backend/js_backend.dart' show JavaScriptBackend, Namer;
 import '../../world.dart' show ClosedWorld;
 import '../js_emitter.dart' show CodeEmitterTask, NativeEmitter;
 import '../js_emitter.dart' as emitterTask show Emitter, EmitterFactory;
 import '../model.dart';
 import '../program_builder/program_builder.dart' show ProgramBuilder;
 import 'model_emitter.dart';
 
 class EmitterFactory implements emitterTask.EmitterFactory {
   @override
-  String get patchVersion => "lazy";
-
-  @override
   bool get supportsReflection => false;
 
   @override
   Emitter createEmitter(
       CodeEmitterTask task, Namer namer, ClosedWorld closedWorld) {
     return new Emitter(task.compiler, namer, task.nativeEmitter);
   }
 }
 
 class Emitter implements emitterTask.Emitter {
@@ skipping 146 matching lines @@
         reporter.internalError(
             NO_LOCATION_SPANNABLE, "Unhandled Builtin: $builtin");
         return null;
     }
   }
 
   @override
   // TODO(het): Generate this correctly
   int generatedSize(OutputUnit unit) => 0;
 }