Fix various nits in VM patch files.

sdk/lib/io/http_headers.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;
 
 class _HttpHeaders implements HttpHeaders {
   final Map<String, List<String>> _headers;
   final String protocolVersion;
 
@@ skipping 594 matching lines @@
     return value;
   }
 }
 
 
 class _HeaderValue implements HeaderValue {
   String _value;
   Map<String, String> _parameters;
   Map<String, String> _unmodifiableParameters;
 
-  _HeaderValue([String this._value = "", Map<String, String> parameters]) {
+  _HeaderValue([this._value = "", Map<String, String> parameters]) {
     if (parameters != null) {
       _parameters = new HashMap<String, String>.from(parameters);
     }
   }
 
   static _HeaderValue parse(String value,
                             {parameterSeparator: ";",
                              valueSeparator: null,
                              preserveBackslash: false}) {
     // Parse the string.
@@ skipping 354 matching lines @@
             (codeUnit >= 0x23 && codeUnit <= 0x2B) ||
             (codeUnit >= 0x2D && codeUnit <= 0x3A) ||
             (codeUnit >= 0x3C && codeUnit <= 0x5B) ||
             (codeUnit >= 0x5D && codeUnit <= 0x7E))) {
         throw new FormatException(
             "Invalid character in cookie value, code unit: '$codeUnit'");
       }
     }
   }
 }