Remove the http package from the repo.

pkg/http/test/io/multipart_test.dart

-// 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 http.test.io.multipart_test;
-
-import 'dart:async';
-import 'dart:io';
-
-import 'package:http/http.dart' as http;
-import 'package:path/path.dart' as path;
-import 'package:unittest/unittest.dart';
-
-import 'utils.dart';
-
-void main() {
-  var tempDir;
-  setUp(() {
-    tempDir = Directory.systemTemp.createTempSync('http_test_');
-  });
-
-  tearDown(() => tempDir.deleteSync(recursive: true));
-
-  test('with a file from disk', () {
-    expect(new Future.sync(() {
-      var filePath = path.join(tempDir.path, 'test-file');
-      new File(filePath).writeAsStringSync('hello');
-      return http.MultipartFile.fromPath('file', filePath);
-    }).then((file) {
-      var request = new http.MultipartRequest('POST', dummyUrl);
-      request.files.add(file);
-
-      expect(request, bodyMatches('''
-        --{{boundary}}
-        content-type: application/octet-stream
-        content-disposition: form-data; name="file"; filename="test-file"
-
-        hello
-        --{{boundary}}--
-      '''));
-    }), completes);
-  });
-}