Removed fixed dependencies

packages/analyzer/lib/src/dart/element/utilities.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.dart.element.utilities;
+
+import 'dart:collection';
+
+import 'package:analyzer/dart/element/element.dart';
+import 'package:analyzer/dart/element/visitor.dart';
+
+/**
+ * A visitor that can be used to collect all of the non-synthetic elements in an
+ * element model.
+ */
+class ElementGatherer extends GeneralizingElementVisitor {
+  /**
+   * The set in which the elements are collected.
+   */
+  final Set<Element> elements = new HashSet<Element>();
+
+  /**
+   * Initialize the visitor.
+   */
+  ElementGatherer();
+
+  @override
+  void visitElement(Element element) {
+    if (!element.isSynthetic) {
+      elements.add(element);
+    }
+    super.visitElement(element);
+  }
+}