Add name/offset constructors for default parameter elements.

pkg/analyzer/lib/src/summary/resynthesize.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 summary_resynthesizer;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
@@ skipping 1294 matching lines @@
     }
     return buildType(type);
   }
 
   /**
    * Resynthesize a [ParameterElement].
    */
   ParameterElement buildParameter(UnlinkedParam serializedParameter) {
     ParameterElementImpl parameterElement;
     if (serializedParameter.isInitializingFormal) {
-      parameterElement = new FieldFormalParameterElementImpl.forNameAndOffset(
+      parameterElement = new FieldFormalParameterElementImpl(
           serializedParameter.name, serializedParameter.nameOffset)
         ..field = fields[serializedParameter.name];
     } else {
       parameterElement = new ParameterElementImpl(
           serializedParameter.name, serializedParameter.nameOffset);
     }
     if (serializedParameter.isFunctionTyped) {
       FunctionElementImpl parameterTypeElement =
           new FunctionElementImpl('', -1);
       parameterTypeElement.synthetic = true;
@@ skipping 512 matching lines @@
                 }
               : () => this.element;
       // TODO(paulberry): Is it a bug that we have to pass `false` for
       // isInstantiated?
       return new DeferredFunctionTypeImpl(computer, null, typeArguments, false);
     } else {
       return null;
     }
   }
 }