Remove memento.

pkg/analyzer/test/src/task/model_test.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 test.src.task.model_test;
 
 import 'package:analyzer/src/generated/engine.dart' hide AnalysisTask;
 import 'package:analyzer/src/generated/java_engine.dart';
 import 'package:analyzer/src/task/model.dart';
 import 'package:analyzer/task/model.dart';
@@ skipping 108 matching lines @@
   test_createTask() {
     BuildTask buildTask =
         (context, target) => new TestAnalysisTask(context, target);
     CreateTaskInputs createTaskInputs = (target) {};
     List<ResultDescriptor> results = <ResultDescriptor>[];
     TaskDescriptorImpl descriptor =
         new TaskDescriptorImpl('name', buildTask, createTaskInputs, results);
     AnalysisContext context = null;
     AnalysisTarget target = new TestSource();
     Map<String, dynamic> inputs = {};
-    String inputMemento = 'main() {}';
-    AnalysisTask createTask =
-        descriptor.createTask(context, target, inputs, inputMemento);
+    AnalysisTask createTask = descriptor.createTask(context, target, inputs);
     expect(createTask, isNotNull);
     expect(createTask.context, context);
     expect(createTask.inputs, inputs);
-    expect(createTask.inputMemento, inputMemento);
     expect(createTask.target, target);
   }
 }