Rename nestingMiddleware to PathHandler.nestedIn.

lib/src/util/path_handler.dart

Index: lib/src/util/path_handler.dart
diff --git a/lib/src/util/path_handler.dart b/lib/src/util/path_handler.dart
index aa8d054206b1a238c3605b1436bf553d770796f1..56597131630ba9e71be76a3f9e8ef398764cfc90 100644
--- a/lib/src/util/path_handler.dart
+++ b/lib/src/util/path_handler.dart
@@ -13,7 +13,14 @@ class PathHandler {
   /// The shelf handler.
   shelf.Handler get handler => _onRequest;
 
-  PathHandler();
+  /// Returns middleware that nests all requests beneath the URL prefix
+  /// [beneath].
+  static shelf.Middleware nestedIn(String beneath) {
+    return (handler) {
+      var pathHandler = new PathHandler()..add(beneath, handler);
+      return pathHandler.handler;
+    };
+  }
 
   /// Routes requests at or under [path] to [handler].
   ///
@@ -47,14 +54,6 @@ class PathHandler {
   }
 }
 
-/// Returns middleware that nests all requests beneath the URL prefix [beneath].
-shelf.Middleware nestingMiddleware(String beneath) {
-  return (handler) {
-    var pathHandler = new PathHandler()..add(beneath, handler);
-    return pathHandler.handler;
-  };
-}
-
 /// A trie node.
 class _Node {
   shelf.Handler handler;