Rip out the last dart:io dependency from pkg/http.

pkg/http/test/streamed_request_test.dart

 // Copyright (c) 2012, 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.
 
 library streamed_request_test;
 
 import 'dart:convert';
 
 import 'package:http/http.dart' as http;
 import 'package:unittest/unittest.dart';
 
 import 'utils.dart';
 
 void main() {
   group('contentLength', () {
     test('defaults to null', () {
       var request = new http.StreamedRequest('POST', dummyUrl);
       expect(request.contentLength, isNull);
     });
 
     test('disallows negative values', () {
       var request = new http.StreamedRequest('POST', dummyUrl);
       expect(() => request.contentLength = -1, throwsArgumentError);
     });
 
-    test('controls the Content-Length header', () {
-      return startServer().then((_) {
-        var request = new http.StreamedRequest('POST', serverUrl);
-        request.contentLength = 10;
-        request.sink.add([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
-        request.sink.close();
-
-        return request.send();
-      }).then((response) {
-        expect(UTF8.decodeStream(response.stream),
-            completion(parse(containsPair('headers',
-                containsPair('content-length', ['10'])))));
-      }).whenComplete(stopServer);
-    });
-
-    test('defaults to sending no Content-Length', () {
-      return startServer().then((_) {
-        var request = new http.StreamedRequest('POST', serverUrl);
-        request.sink.add([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
-        request.sink.close();
-
-        return request.send();
-      }).then((response) {
-        expect(UTF8.decodeStream(response.stream),
-            completion(parse(containsPair('headers',
-                isNot(contains('content-length'))))));
-      }).whenComplete(stopServer);
-    });
-
     test('is frozen by finalize()', () {
       var request = new http.StreamedRequest('POST', dummyUrl);
       request.finalize();
       expect(() => request.contentLength = 10, throwsStateError);
     });
   });
-
-  // Regression test.
-  test('.send() with a response with no content length', () {
-    return startServer().then((_) {
-      var request = new http.StreamedRequest(
-          'GET', serverUrl.resolve('/no-content-length'));
-      request.sink.close();
-      return request.send();
-    }).then((response) {
-      expect(UTF8.decodeStream(response.stream), completion(equals('body')));
-    }).whenComplete(stopServer);
-  });
-
 }