Improve support for HTTP 1.0 clients

tests/standalone/io/http_content_length_test.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.
 
 import "dart:isolate";
 import "dart:io";
 
 void testNoBody(int totalConnections, bool explicitContentLength) {
   var errors = 0;
   HttpServer.bind("127.0.0.1", 0, totalConnections).then((server) {
@@ skipping 181 matching lines @@
                     client.close();
                     server.close();
                   }
                 });
           })
           .catchError((e) => Expect.fail("Unexpected error $e"));
     }
   });
 }
 
-void testHttp10() {
-  HttpServer.bind("127.0.0.1", 0, 5).then((server) {
-    server.listen(
-        (HttpRequest request) {
-          Expect.isNull(request.headers.value('content-length'));
-          Expect.equals(-1, request.contentLength);
-          var response = request.response;
-          response.contentLength = 0;
-          Expect.equals("1.0", request.protocolVersion);
-          response.done
-              .then((_) => Expect.fail("Unexpected response completion"))
-              .catchError((e) => Expect.isTrue(e.error is HttpException));
-          response.addString("x");
-          response.close();
-          Expect.throws(() => response.addString("x"),
-                        (e) => e is StateError);
-        },
-        onError: (e) => Expect.fail("Unexpected error $e"));
-
-    Socket.connect("127.0.0.1", server.port).then((socket) {
-      socket.addString("GET / HTTP/1.0\r\n\r\n");
-      socket.close();
-      socket.listen(
-          (d) { },
-          onDone: () {
-            socket.destroy();
-            server.close();
-          });
-    });
-  });
-}
-
 void main() {
   testNoBody(5, false);
   testNoBody(5, true);
   testBody(5, false);
   testBody(5, true);
   testBodyChunked(5, false);
   testBodyChunked(5, true);
-  testHttp10();
 }