dart2js: Use deferredFragments getter.

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

 // Copyright (c) 2015, 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.startup_emitter.model_emitter;
 
 import '../../constants/values.dart' show ConstantValue, FunctionConstantValue;
 import '../../dart2jslib.dart' show Compiler;
 import '../../elements/elements.dart' show ClassElement, FunctionElement;
 import '../../js/js.dart' as js;
@@ skipping 110 matching lines @@
     if (isConstantInlinedOrAlreadyEmitted(value)) {
       return constantEmitter.generate(value);
     }
     return js.js('#.#', [namer.globalObjectForConstant(value),
     namer.constantName(value)]);
   }
 
   int emitProgram(Program program) {
     List<Fragment> fragments = program.fragments;
     MainFragment mainFragment = fragments.first;
+    Iterable<Fragment> deferredFragments = program.deferredFragments;
 
     int totalSize = 0;
 
     FragmentEmitter fragmentEmitter =
         new FragmentEmitter(compiler, namer, backend, constantEmitter, this);
 
     // 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);
           return fragmentEmitter.emitDeferredFragment(
               deferredFragment, types, program.holders);
         }).toList();
 
     js.Statement mainAst = fragmentEmitter.emitMainFragment(program);
 
     js.TokenCounter counter = new js.TokenCounter();
@@ skipping 20 matching lines @@
     return totalSize;
   }
 
   String buildGeneratedBy(compiler) {
     var suffix = '';
     if (compiler.hasBuildId) suffix = ' version: ${compiler.buildId}';
     return '// Generated by dart2js (fast startup), '
         'the Dart to JavaScript compiler$suffix.\n';
   }
 }