Revert "Emit named parameter information in declaration order."

sdk/lib/_internal/compiler/implementation/js_emitter/metadata_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 MetadataEmitter extends CodeEmitterHelper {
   /// A list of JS expressions that represent metadata, parameter names and
   /// type, and return types.
   final List<String> globalMetadata = [];
@@ skipping 28 matching lines @@
       if (metadata.isEmpty) return null;
       return js.fun(
           [], [js.return_(new jsAst.ArrayInitializer.from(metadata))]);
     });
   }
 
   List<int> reifyDefaultArguments(FunctionElement function) {
     FunctionSignature signature = function.computeSignature(compiler);
     if (signature.optionalParameterCount == 0) return const [];
     List<int> defaultValues = <int>[];
-    for (Element element in signature.optionalParameters) {
+    for (Element element in signature.orderedOptionalParameters) {
       Constant value =
           compiler.constantHandler.initialVariableValues[element];
       String stringRepresentation = (value == null)
           ? "null"
           : jsAst.prettyPrint(task.constantReference(value), compiler)
               .getText();
       defaultValues.add(addGlobalMetadata(stringRepresentation));
     }
     return defaultValues;
   }
@@ skipping 66 matching lines @@
       // TODO(ahe): Why is metadata sometimes null?
       if (link != null) {
         for (; !link.isEmpty; link = link.tail) {
           metadata.add(reifyMetadata(link.head));
         }
       }
       return metadata;
     });
   }
 }