Resynthesize constructor initializers.

pkg/analyzer/lib/src/generated/testing/element_factory.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 analyzer.src.generated.testing.element_factory;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
@@ skipping 100 matching lines @@
         parameter.parameterKind = ParameterKind.REQUIRED;
         parameters[i] = parameter;
       }
       constructor.parameters = parameters;
     } else {
       constructor.parameters = <ParameterElement>[];
     }
     constructor.returnType = type;
     constructor.enclosingElement = definingClass;
     constructor.type = new FunctionTypeImpl(constructor);
+    if (!constructor.isSynthetic) {
+      constructor.constantInitializers = <ConstructorInitializer>[];
+    }
     return constructor;
   }
 
   static ConstructorElementImpl constructorElement2(
           ClassElement definingClass, String name,
           [List<DartType> argumentTypes]) =>
       constructorElement(definingClass, name, false, argumentTypes);
 
   static ClassElementImpl enumElement(
       TypeProvider typeProvider, String enumName,
@@ skipping 494 matching lines @@
   }
 
   static TypeParameterElementImpl typeParameterWithType(String name,
       [DartType bound]) {
     TypeParameterElementImpl typeParameter = typeParameterElement(name);
     typeParameter.type = new TypeParameterTypeImpl(typeParameter);
     typeParameter.bound = bound;
     return typeParameter;
   }
 }