Rename nestingMiddleware to PathHandler.nestedIn.

lib/src/runner/browser/platform.dart

 // Copyright (c) 2016, 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.
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 
 import 'package:async/async.dart';
 import 'package:http_multi_server/http_multi_server.dart';
@@ skipping 115 matching lines @@
           .add(_jsHandler.handler)
           .add(createStaticHandler(_root))
           .add(_wrapperHandler);
 
       if (config.precompiledPath != null) {
         cascade = cascade.add(createStaticHandler(config.precompiledPath));
       }
     }
 
     var pipeline = new shelf.Pipeline()
-        .addMiddleware(nestingMiddleware(_secret))
+        .addMiddleware(PathHandler.nestedIn(_secret))
         .addHandler(cascade.handler);
 
     _server.mount(pipeline);
   }
 
   /// A handler that serves wrapper files used to bootstrap tests.
   shelf.Response _wrapperHandler(shelf.Request request) {
     var path = p.fromUri(request.url);
 
     if (path.endsWith(".browser_test.dart")) {
@@ skipping 271 matching lines @@
     await Future.wait(futures);
 
     if (_config.pubServeUrl == null) {
       new Directory(_compiledDir).deleteSync(recursive: true);
     } else {
       _http.close();
     }
   });
   final _closeMemo = new AsyncMemoizer();
 }