dart2js: Use deferredFragments getter.

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

Index: pkg/compiler/lib/src/js_emitter/startup_emitter/model_emitter.dart
diff --git a/pkg/compiler/lib/src/js_emitter/startup_emitter/model_emitter.dart b/pkg/compiler/lib/src/js_emitter/startup_emitter/model_emitter.dart
index 9797dbb60f546d8fd3ce5080dd46d55ac10955cf..63fc5a1bad4e13ff3cdcee581dadeb4f319e115d 100644
--- a/pkg/compiler/lib/src/js_emitter/startup_emitter/model_emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/startup_emitter/model_emitter.dart
@@ -128,6 +128,7 @@ class ModelEmitter {
   int emitProgram(Program program) {
     List<Fragment> fragments = program.fragments;
     MainFragment mainFragment = fragments.first;
+    Iterable<Fragment> deferredFragments = program.deferredFragments;
 
     int totalSize = 0;
 
@@ -137,7 +138,7 @@ class ModelEmitter {
     // 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 deferredFragment) {
           js.Expression types =
           program.metadataTypesForOutputUnit(deferredFragment.outputUnit);