Revert fix for type checking of void type, because some top level tests fail.

runtime/bin/http_parser.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.
 
 // Global constants.
 class _Const {
   // Bytes for "HTTP".
   static final HTTP = const [72, 84, 84, 80];
   // Bytes for "HTTP/1.".
   static final HTTP1DOT = const [72, 84, 84, 80, 47, 49, 46];
@@ skipping 594 matching lines @@
         break;
     }
     return null;
   }
 
   int get messageType() => _messageType;
   int get contentLength() => _contentLength;
   bool get upgrade() => _connectionUpgrade && _state == _State.UPGRADED;
   bool get persistentConnection() => _persistentConnection;
 
-  void set responseToMethod(String method) { _responseToMethod = method; }
+  void set responseToMethod(String method) => _responseToMethod = method;
 
   bool get isIdle() => _state == _State.START;
 
   List<int> get unparsedData() => _unparsedData;
 
   void _bodyEnd() {
     if (dataEnd != null) {
       dataEnd(_messageType == _MessageType.RESPONSE && !_persistentConnection);
     }
   }
@@ skipping 91 matching lines @@
   Function dataEnd;
   Function error;
 }
 
 
 class HttpParserException implements Exception {
   const HttpParserException([String this.message = ""]);
   String toString() => "HttpParserException: $message";
   final String message;
 }