Make source be a target

pkg/analyzer/lib/src/task/targets.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 analyzer.src.task.targets;
-
-import 'package:analyzer/src/generated/source.dart';
-import 'package:analyzer/task/model.dart';
-
-/**
- * A `SourceTarget` is a [Source] that can be used as an [AnalysisTarget].
- */
-class SourceTarget implements AnalysisTarget {
-  /**
-   * The source being represented as a target.
-   */
-  final Source source;
-
-  /**
-   * Initialize a newly created target to represent the given [source].
-   */
-  SourceTarget(this.source);
-
-  @override
-  int get hashCode => source.hashCode;
-
-  @override
-  bool operator ==(Object object) {
-    return object is SourceTarget && object.source == source;
-  }
-}