dart2js: remove additionalProperties and store it directly as nativeBlob.

pkg/compiler/lib/src/js_emitter/program_builder.dart

 // Copyright (c) 2014, 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.program_builder;
 
 import 'js_emitter.dart' show computeMixinClass;
 import 'model.dart';
 
 import '../common.dart';
@@ skipping 81 matching lines @@
       if (c is MixinApplication) {
         c.setMixinClass(_classes[computeMixinClass(element)]);
         assert(c.mixinClass != null);
       }
     });
 
     List<Class> nativeClasses = _task.nativeOrExtendsNativeClasses
         .map((ClassElement classElement) => _classes[classElement])
         .toList();
 
-    Map<Class, Map<String, js.Expression>> additionalProperties =
-        new Map<Class, Map<String, js.Expression>>();
-
     _unneededNativeClasses =
-        _task.nativeEmitter.prepareNativeClasses(
-            nativeClasses,
-            additionalProperties);
+        _task.nativeEmitter.prepareNativeClasses(nativeClasses);
 
     MainFragment mainOutput = _buildMainOutput(_registry.mainLibrariesMap);
     Iterable<Fragment> deferredOutputs = _registry.deferredLibrariesMap
         .map((librariesMap) => _buildDeferredOutput(mainOutput, librariesMap));
 
     List<Fragment> outputs = new List<Fragment>(_registry.librariesMapCount);
     outputs[0] = mainOutput;
     outputs.setAll(1, deferredOutputs);
 
     _markEagerClasses();
 
     bool containsNativeClasses =
         nativeClasses.length != _unneededNativeClasses.length;
 
     return new Program(
         outputs,
-        additionalProperties,
         _buildLoadMap(),
         outputContainsNativeClasses: containsNativeClasses,
         outputContainsConstantList: _task.outputContainsConstantList);
   }
 
   void _markEagerClasses() {
     _markEagerInterceptorClasses();
   }
 
   /// Builds a map from loadId to outputs-to-load.
@@ skipping 381 matching lines @@
       _registry.registerConstant(outputUnit, constantValue);
       assert(!_constants.containsKey(constantValue));
       String name = namer.constantName(constantValue);
       String constantObject = namer.globalObjectForConstant(constantValue);
       Holder holder = _registry.registerHolder(constantObject);
       Constant constant = new Constant(name, holder, constantValue);
       _constants[constantValue] = constant;
     }
   }
 }