Make hashCode a getter and not a method.

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 1184 matching lines @@
   void set onError(void callback(e)) {
     _requestOrResponse._streamSetErrorHandler(callback);
   }
 
   _HttpRequestResponseBase _requestOrResponse;
 }
 
 
 class _HttpConnectionBase {
   _HttpConnectionBase() : _sendBuffers = new Queue(),
-                          _httpParser = new _HttpParser() {
-    _hashCode = _nextHashCode;
+                          _httpParser = new _HttpParser(),
+                          hashCode = _nextHashCode {
     _nextHashCode = (_nextHashCode + 1) & 0xFFFFFFF;
   }
 
   void _connectionEstablished(Socket socket) {
     _socket = socket;
     // Register handler for socket events.
     _socket.onData = _onData;
     _socket.onClosed = _onClosed;
     _socket.onError = _onError;
     // Ignore errors in the socket output stream as this is getting
@@ skipping 83 matching lines @@
 
   abstract void _onConnectionClosed(e);
   abstract void _responseDone();
 
   void set _onNoPendingWrites(void callback()) {
     if (!_error) {
       _socket.outputStream.onNoPendingWrites = callback;
     }
   }
 
-  int hashCode() => _hashCode;
-
   Socket _socket;
   bool _closing = false;  // Is the socket closed by the client?
   bool _error = false;  // Is the socket closed due to an error?
   _HttpParser _httpParser;
 
   Queue _sendBuffers;
 
   Function onDetach;
 
   // Hash code for HTTP connection. Currently this is just a counter.
-  int _hashCode;
+  final int hashCode;
   static int _nextHashCode = 0;
 }
 
 
 // HTTP server connection over a socket.
 class _HttpConnection extends _HttpConnectionBase {
   _HttpConnection(HttpServer this._server) {
     // Register HTTP parser callbacks.
     _httpParser.requestStart =
       (method, uri, version) => _onRequestStart(method, uri, version);
@@ skipping 624 matching lines @@
 
   void _markReturned() {
     _socket.onData = null;
     _socket.onClosed = null;
     _socket.onError = null;
     _returnTime = new Date.now();
   }
 
   Duration _idleTime(Date now) => now.difference(_returnTime);
 
-  int hashCode() => _socket.hashCode();
+  int get hashCode => _socket.hashCode;
 
   String _host;
   int _port;
   Socket _socket;
   Date _returnTime;
 }
 
 class _ProxyConfiguration {
   static const String PROXY_PREFIX = "PROXY ";
   static const String DIRECT_PREFIX = "DIRECT";
@@ skipping 313 matching lines @@
 
 
 class _RedirectInfo implements RedirectInfo {
   const _RedirectInfo(int this.statusCode,
                       String this.method,
                       Uri this.location);
   final int statusCode;
   final String method;
   final Uri location;
 }