Merge the dart:uri library into dart:core and update the Uri class

pkg/http/lib/http.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.
 
 /// A composable, [Future]-based library for making HTTP requests.
 ///
 /// ## Installing ##
 ///
 /// Use [pub][] to install this package. Add the following to your
 /// `pubspec.yaml` file.
@@ skipping 51 matching lines @@
 ///         request.headers[HttpHeaders.USER_AGENT] = userAgent;
 ///         return _inner.send(request);
 ///       }
 ///     }
 ///
 /// [pub]: http://pub.dartlang.org
 library http;
 
 import 'dart:async';
 import 'dart:typed_data';
-import 'dart:uri';
 
 import 'src/client.dart';
 import 'src/response.dart';
 
 export 'src/base_client.dart';
 export 'src/base_request.dart';
 export 'src/base_response.dart';
 export 'src/byte_stream.dart';
 export 'src/client.dart';
 export 'src/multipart_file.dart';
@@ skipping 96 matching lines @@
 /// For more fine-grained control over the request and response, use [Request]
 /// instead.
 Future<Uint8List> readBytes(url, {Map<String, String> headers}) =>
   _withClient((client) => client.readBytes(url, headers: headers));
 
 Future _withClient(Future fn(Client)) {
   var client = new Client();
   var future = fn(client);
   return future.whenComplete(client.close);
 }