Translate Java enums to Dart constants.

pkg/analyzer/lib/src/generated/utilities_collection.dart

Index: pkg/analyzer/lib/src/generated/utilities_collection.dart
diff --git a/pkg/analyzer/lib/src/generated/utilities_collection.dart b/pkg/analyzer/lib/src/generated/utilities_collection.dart
index b8b789097ed2441731ef63bcdff62869fbdfe79a..c938d9f10bb7f20655b076ca917d4aa92ecb8bf0 100644
--- a/pkg/analyzer/lib/src/generated/utilities_collection.dart
+++ b/pkg/analyzer/lib/src/generated/utilities_collection.dart
@@ -336,7 +336,7 @@ class DirectedGraph_SccFinder<N> {
   /**
    * The graph to work with.
    */
-  DirectedGraph<N> _graph;
+  final DirectedGraph<N> _graph;
 
   /**
    * The index used to uniquely identify the depth of nodes.
@@ -356,9 +356,7 @@ class DirectedGraph_SccFinder<N> {
   /**
    * Initialize a newly created finder.
    */
-  DirectedGraph_SccFinder(DirectedGraph<N> graph) : super() {
-    this._graph = graph;
-  }
+  DirectedGraph_SccFinder(this._graph) : super();
 
   /**
    * Return a list containing the nodes that are part of the strongly connected component that