Stop sniffing user agent in vm service http server

runtime/bin/vmservice/server.dart

 // Copyright (c) 2013, 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.
 
 part of vmservice_io;
 
 class WebSocketClient extends Client {
   static const int PARSE_ERROR_CODE = 4000;
   static const int BINARY_MESSAGE_ERROR_CODE = 4001;
   static const int NOT_MAP_ERROR_CODE = 4002;
@@ skipping 77 matching lines @@
   final int _port;
 
   HttpServer _server;
   bool get running => _server != null;
   bool _displayMessages = false;
 
   Server(this._service, this._ip, this._port) {
     _displayMessages = (_ip != '127.0.0.1' || _port != 8181);
   }
 
-  bool _shouldServeObservatory(HttpRequest request) {
-    if (request.headers['Observatory-Version'] != null) {
-      // Request is already coming from Observatory.
-      return false;
-    }
-    // TODO(johnmccutchan): Test with obscure browsers.
-    if (request.headers.value(HttpHeaders.USER_AGENT).contains('Mozilla')) {
-      // Request is coming from a browser but not Observatory application.
-      // Serve Observatory and let the Observatory make the real request.
-      return true;
-    }
-    // All other user agents are assumed to be textual.
-    return false;
-  }
-
   void _requestHandler(HttpRequest request) {
     // Allow cross origin requests with 'observatory' header.
     request.response.headers.add('Access-Control-Allow-Origin', '*');
     request.response.headers.add('Access-Control-Allow-Headers',
                                  'Observatory-Version');
 
     if (request.method != 'GET') {
       // Not a GET request. Do nothing.
       request.response.close();
       return;
     }
 
     final String path =
           request.uri.path == '/' ? ROOT_REDIRECT_PATH : request.uri.path;
 
     if (path == WEBSOCKET_PATH) {
       WebSocketTransformer.upgrade(request).then((WebSocket webSocket) {
         new WebSocketClient(webSocket, _service);
       });
       return;
     }
 
     var resource = Resource.resources[path];
-    if (resource == null && _shouldServeObservatory(request)) {
-      resource = Resource.resources[ROOT_REDIRECT_PATH];
-      assert(resource != null);
-    }
     if (resource != null) {
       // Serving up a static resource (e.g. .css, .html, .png).
       request.response.headers.contentType =
           ContentType.parse(resource.mimeType);
       request.response.add(resource.data);
       request.response.close();
       return;
     }
     var client = new HttpRequestClient(request, _service);
     var message = new Message.fromUri(client, request.uri);
@@ skipping 56 matching lines @@
       print('Could not shutdown Observatory HTTP server:\n$e\n$st\n');
       _notifyServerState("", 0);
       return this;
     });
   }
 
 }
 
 void _notifyServerState(String ip, int port)
     native "VMServiceIO_NotifyServerState";