Expand usage of defaultEncoding in HttpBody in the http_server package.

pkg/http_server/lib/src/http_body_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 http_server;
 
 class _HttpBodyHandlerTransformer
     extends StreamEventTransformer<HttpRequest, HttpRequestBody> {
   final Encoding _defaultEncoding;
   _HttpBodyHandlerTransformer(this._defaultEncoding);
@@ skipping 49 matching lines @@
           .fold(new StringBuffer(), (buffer, data) => buffer..write(data))
           .then((buffer) => new _HttpBody(contentType,
                                           "text",
                                           buffer.toString()));
     }
 
     Future<HttpBody> asFormData() {
       return stream
           .transform(new MimeMultipartTransformer(
                 contentType.parameters['boundary']))
-          .map((HttpMultipartFormData.parse))
+          .map((part) => HttpMultipartFormData.parse(
+                part, defaultEncoding: defaultEncoding))
           .map((multipart) {
             var future;
             if (multipart.isText) {
               future = multipart
                   .fold(new StringBuffer(), (b, s) => b..write(s))
                   .then((b) => b.toString());
             } else {
               future = multipart
                   .fold(new BytesBuilder(), (b, d) => b..add(d))
                   .then((b) => b.takeBytes());
@@ skipping 19 matching lines @@
             return new _HttpBody(contentType, 'form', map);
           });
     }
 
     if (contentType == null) {
       return asBinary();
     }
 
     switch (contentType.primaryType) {
       case "text":
-        return asText(ASCII);
+        return asText(defaultEncoding);
 
       case "application":
         switch (contentType.subType) {
           case "json":
             return asText(UTF8)
                 .then((body) => new _HttpBody(contentType,
                                               "json",
                                               JSON.decode(body.body)));
 
           case "x-www-form-urlencoded":
@@ skipping 69 matching lines @@
   _HttpClientResponseBody(HttpClientResponse response, HttpBody body)
       : super(body.contentType, body.type, body.body),
         this.response = response;
 
   int get statusCode => response.statusCode;
 
   String get reasonPhrase => response.reasonPhrase;
 
   HttpHeaders get headers => response.headers;
 }