pkg/http tweaks

pkg/http/lib/src/base_response.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 base_response;
 
-import 'dart:io';
-
 import 'base_request.dart';
 
 /// The base class for HTTP responses.
 ///
 /// Subclasses of [BaseResponse] are usually not constructed manually; instead,
 /// they're returned by [BaseClient.send] or other HTTP client methods.
 abstract class BaseResponse {
   /// The (frozen) request that triggered this response.
   final BaseRequest request;
 
@@ skipping 22 matching lines @@
   /// Creates a new HTTP response.
   BaseResponse(
       this.statusCode,
       this.contentLength,
       {this.request,
        this.headers: const {},
        this.isRedirect: false,
        this.persistentConnection: true,
        this.reasonPhrase});
 }