dart2js: Use deferredFragments getter.

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

Index: pkg/compiler/lib/src/js_emitter/lazy_emitter/model_emitter.dart
diff --git a/pkg/compiler/lib/src/js_emitter/lazy_emitter/model_emitter.dart b/pkg/compiler/lib/src/js_emitter/lazy_emitter/model_emitter.dart
index ee7030ee960a7e547cb71af2b26ac6991f25ef57..e0860dca18672550fbfc6ffe7e7550f608ed79a1 100644
--- a/pkg/compiler/lib/src/js_emitter/lazy_emitter/model_emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/lazy_emitter/model_emitter.dart
@@ -129,13 +129,14 @@ class ModelEmitter {
   int emitProgram(Program program) {
     List<Fragment> fragments = program.fragments;
     MainFragment mainFragment = fragments.first;
+    Iterable<Fragment> deferredFragments = program.deferredFragments;
 
     int totalSize = 0;
 
     // We have to emit the deferred fragments first, since we need their
     // deferred hash (which depends on the output) when emitting the main
     // fragment.
-    List<js.Expression> fragmentsCode = fragments.skip(1).map(
+    List<js.Expression> fragmentsCode = deferredFragments.map(
             (DeferredFragment deferredUnit) {
       js.Expression types =
           program.metadataTypesForOutputUnit(deferredUnit.outputUnit);