Change fromString constructor to parse static method

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;
 
 class _HttpIncoming extends Stream<List<int>> {
   final int _transferLength;
   final Completer _dataCompleter = new Completer();
   Stream<List<int>> _stream;
@@ skipping 273 matching lines @@
       }
 
       // Fall through to here to perform normal response handling if
       // there is no sensible authorization handling.
       return new Future.value(this);
     }
 
     List<String> challenge = headers[HttpHeaders.WWW_AUTHENTICATE];
     assert(challenge != null || challenge.length == 1);
     _HeaderValue header =
-        new _HeaderValue.fromString(challenge[0], parameterSeparator: ",");
+        _HeaderValue.parse(challenge[0], parameterSeparator: ",");
     _AuthenticationScheme scheme =
         new _AuthenticationScheme.fromString(header.value);
     String realm = header.parameters["realm"];
 
     // See if any matching credentials are available.
     _Credentials cr = _httpClient._findCredentials(_httpRequest.uri, scheme);
     if (cr != null) {
       // For basic authentication don't retry already used credentials
       // as they must have already been added to the request causing
       // this authenticate response.
@@ skipping 59 matching lines @@
           return _httpClient._openUrlFromRequest(_httpRequest.method,
                                                  _httpRequest.uri,
                                                  _httpRequest)
               .then((request) => request.close());
         });
     }
 
     List<String> challenge = headers[HttpHeaders.PROXY_AUTHENTICATE];
     assert(challenge != null || challenge.length == 1);
     _HeaderValue header =
-        new _HeaderValue.fromString(challenge[0], parameterSeparator: ",");
+        _HeaderValue.parse(challenge[0], parameterSeparator: ",");
     _AuthenticationScheme scheme =
         new _AuthenticationScheme.fromString(header.value);
     String realm = header.parameters["realm"];
 
     // See if any credentials are available.
     var proxy = _httpRequest._proxy;
 
     var cr =  _httpClient._findProxyCredentials(proxy);
     if (cr != null) {
       return retryWithProxyCredentials(cr);
@@ skipping 793 matching lines @@
                   } else {
                     destroy();
                   }
                 });
                 // For digest authentication check if the server
                 // requests the client to start using a new nonce.
                 if (cr != null && cr.scheme == _AuthenticationScheme.DIGEST) {
                   var authInfo = incoming.headers["authentication-info"];
                   if (authInfo != null && authInfo.length == 1) {
                     var header =
-                        new _HeaderValue.fromString(
+                        _HeaderValue.parse(
                             authInfo[0], parameterSeparator: ',');
                     var nextnonce = header.parameters["nextnonce"];
                     if (nextnonce != null) cr.nonce = nextnonce;
                   }
                 }
                 request._onIncoming(incoming);
               })
               // If we see a state error, we failed to get the 'first'
               // element.
               // Transform the error to a HttpParserException, for
@@ skipping 979 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;
 }