Implement JsKernelToElementMap through KernelToElementMapBase

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

Index: pkg/compiler/lib/src/js_emitter/startup_emitter/emitter.dart
diff --git a/pkg/compiler/lib/src/js_emitter/startup_emitter/emitter.dart b/pkg/compiler/lib/src/js_emitter/startup_emitter/emitter.dart
index c50717a9e1a97727c78c0044ba22094162b6aecf..1a2f8218fc30af48482d11297820d2eb1e6d04e7 100644
--- a/pkg/compiler/lib/src/js_emitter/startup_emitter/emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/startup_emitter/emitter.dart
@@ -20,6 +20,7 @@ import '../js_emitter.dart' show CodeEmitterTask, NativeEmitter;
 import '../js_emitter.dart' as emitterTask show EmitterBase, EmitterFactory;
 import '../model.dart';
 import '../program_builder/program_builder.dart' show ProgramBuilder;
+import '../sorter.dart' show Sorter;
 import 'model_emitter.dart';
 
 class EmitterFactory implements emitterTask.EmitterFactory {
@@ -31,8 +32,8 @@ class EmitterFactory implements emitterTask.EmitterFactory {
   bool get supportsReflection => false;
 
   @override
-  Emitter createEmitter(
-      CodeEmitterTask task, Namer namer, ClosedWorld closedWorld) {
+  Emitter createEmitter(CodeEmitterTask task, Namer namer,
+      ClosedWorld closedWorld, Sorter sorter) {
     return new Emitter(task.compiler, namer, task.nativeEmitter, closedWorld,
         task, generateSourceMap);
   }