Fix various nits in VM patch files.

sdk/lib/io/http_impl.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 dart.io;
 
 const int _OUTGOING_BUFFER_SIZE = 8 * 1024;
 
 typedef void _BytesConsumer(List<int> bytes);
 
@@ skipping 1655 matching lines @@
   BadCertificateCallback _badCertificateCallback;
 
   Duration get idleTimeout => _idleTimeout;
 
   int maxConnectionsPerHost;
 
   bool autoUncompress = true;
 
   String userAgent = _getHttpVersion();
 
-  _HttpClient(SecurityContext this._context);
+  _HttpClient(this._context);
 
   void set idleTimeout(Duration timeout) {
     _idleTimeout = timeout;
     for (var c in _connectionTargets.values) {
       for (var idle in c._idle) {
         // Reset timer. This is fine, as it's not happening often.
         idle.stopTimer();
         idle.startTimer();
       }
     }
@@ skipping 1175 matching lines @@
   const _RedirectInfo(this.statusCode, this.method, this.location);
 }
 
 String _getHttpVersion() {
   var version = Platform.version;
   // Only include major and minor version numbers.
   int index = version.indexOf('.', version.indexOf('.') + 1);
   version = version.substring(0, index);
   return 'Dart/$version (dart:io)';
 }