Use JS backend in serialization_analysis_test

pkg/compiler/lib/src/enqueue.dart

 // Copyright (c) 2012, 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.enqueue;
 
 import 'dart:collection' show
     Queue;
 
 import 'common.dart';
@@ skipping 785 matching lines @@
     assert(invariant(element, element is AnalyzableElement,
         message: 'Element $element is not analyzable.'));
     if (hasBeenProcessed(element)) return false;
     if (queueIsClosed) {
       throw new SpannableAssertionFailure(element,
           "Resolution work list is closed. Trying to add $element.");
     }
 
     compiler.world.registerUsedElement(element);
 
-    ResolutionWorkItem workItem;
-    if (compiler.serialization.isDeserialized(element)) {
-      workItem = compiler.serialization.createResolutionWorkItem(
-          element, itemCompilationContextCreator());
-    } else {
-      workItem = new ResolutionWorkItem(
-          element, itemCompilationContextCreator());
-    }
+    ResolutionWorkItem workItem = compiler.resolution.createWorkItem(
+        element, itemCompilationContextCreator());
     queue.add(workItem);
 
     // Enable isolate support if we start using something from the isolate
     // library, or timers for the async library.  We exclude constant fields,
     // which are ending here because their initializing expression is compiled.
     LibraryElement library = element.library;
     if (!compiler.hasIsolateSupport &&
         (!element.isField || !element.isConst)) {
       String uri = library.canonicalUri.toString();
       if (uri == 'dart:isolate') {
@@ skipping 244 matching lines @@
   @override
   void visitStaticUse(StaticUse staticUse) {
     enqueuer.registerStaticUse(staticUse);
   }
 
   @override
   void visitTypeUse(TypeUse typeUse) {
     enqueuer.registerTypeUse(typeUse);
   }
 }