Implemented W3C complient web socket client interface

runtime/bin/http_impl.dart

 // Copyright (c) 2012, 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.
 
 class _HttpHeaders implements HttpHeaders {
   _HttpHeaders() : _headers = new Map<String, List<String>>();
 
   List<String> operator[](String name) {
     name = name.toLowerCase();
     return _headers[name];
@@ skipping 1421 matching lines @@
       request.headers.host = host;
       request.headers.port = port;
       if (connection._onRequest != null) {
         connection._onRequest(request);
       } else {
         request.outputStream.close();
       }
     }
 
     _HttpClientConnection connection = new _HttpClientConnection(this);
+    connection.onDetach = () => _activeSockets.remove(connection._socketConn);
 
     // If there are active connections for this key get the first one
     // otherwise create a new one.
     Queue socketConnections = _openSockets[_connectionKey(host, port)];
     if (socketConnections == null || socketConnections.isEmpty()) {
       Socket socket = new Socket(host, port);
       // Until the connection is established handle connection errors
       // here as the HttpClientConnection object is not yet associated
       // with the socket.
       socket.onError = (e) {
@@ skipping 82 matching lines @@
 }
 
 
 class _DetachedSocket implements DetachedSocket {
   _DetachedSocket(this._socket, this._unparsedData);
   Socket get socket() => _socket;
   List<int> get unparsedData() => _unparsedData;
   Socket _socket;
   List<int> _unparsedData;
 }