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

pkg/http/test/io/streamed_request_test.dart

-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2014, 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;
+library http.test.io.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);
   });
 
 }