dart2js: Don't assume fields are needed, if they are static.

pkg/compiler/lib/src/js_emitter/old_emitter/class_emitter.dart

 // Copyright (c) 2013, 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.
 
 part of dart2js.js_emitter;
 
 class ClassEmitter extends CodeEmitterHelper {
 
   ClassStubGenerator get _stubGenerator =>
       new ClassStubGenerator(compiler, namer, backend);
@@ skipping 107 matching lines @@
                    String accessorName,
                    bool needsGetter,
                    bool needsSetter,
                    bool needsCheckedSetter) {
         // Ignore needsCheckedSetter - that is handled below.
         bool needsAccessor = (needsGetter || needsSetter);
         // We need to output the fields for non-native classes so we can auto-
         // generate the constructor.  For native classes there are no
         // constructors, so we don't need the fields unless we are generating
         // accessors at runtime.
-        if (!classIsNative || needsAccessor) {
+        bool needsFieldsForConstructor = !emitStatics && !classIsNative;
+        if (needsFieldsForConstructor || needsAccessor) {
           var metadata = emitter.metadataEmitter.buildMetadataFunction(field);
           if (metadata != null) {
             hasMetadata = true;
           } else {
             metadata = new jsAst.LiteralNull();
           }
           fieldMetadata.add(metadata);
           recordMangledField(field, accessorName,
               namer.privateName(field.library, field.name));
           String fieldName = name;
@@ skipping 480 matching lines @@
           js(r'this.$builtinTypeInfo && this.$builtinTypeInfo[#]', index);
     }
     jsAst.Expression convertRtiToRuntimeType = emitter
         .staticFunctionAccess(backend.findHelper('convertRtiToRuntimeType'));
     compiler.dumpInfoTask.registerElementAst(element,
         builder.addProperty(name,
             js('function () { return #(#) }',
                 [convertRtiToRuntimeType, computeTypeVariable])));
   }
 }