Change MultipartFile.fromFile to MultipartFile.fromPath in pkg/http.

pkg/http/test/utils.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 test_utils;
 
 import 'dart:async';
 import 'dart:io';
 import 'dart:json' as json;
 import 'dart:uri';
 
 import 'package:unittest/unittest.dart';
-import 'package:http/src/byte_stream.dart';
-import 'package:http/http.dart' as http;
-import 'package:http/src/utils.dart';
+import '../lib/src/byte_stream.dart';
+import '../lib/http.dart' as http;
+import '../lib/src/utils.dart';
 
 /// The current server instance.
 HttpServer _server;
 
 /// The URL for the current server instance.
 Uri get serverUrl => Uri.parse('http://localhost:${_server.port}');
 
 /// A dummy URL for constructing requests that won't be sent.
 Uri get dummyUrl => Uri.parse('http://dartlang.org/');
 
@@ skipping 170 matching lines @@
 const isSocketIOException = const _SocketIOException();
 
 /// A matcher for functions that throw SocketIOException.
 const Matcher throwsSocketIOException =
     const Throws(isSocketIOException);
 
 class _SocketIOException extends TypeMatcher {
   const _SocketIOException() : super("SocketIOException");
   bool matches(item, MatchState matchState) => item is SocketIOException;
 }