pkg: analysis aided cleanup

pkg/http/lib/src/io_client.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 io_client;
 
 import 'dart:async';
 import 'dart:io';
 
 import 'base_client.dart';
 import 'base_request.dart';
 import 'streamed_response.dart';
-import 'utils.dart';
 
 /// A `dart:io`-based HTTP client. This is the default client.
 class IOClient extends BaseClient {
   /// The underlying `dart:io` HTTP client.
   HttpClient _inner;
 
   /// Creates a new HTTP client.
   IOClient() : _inner = new HttpClient();
 
   /// Sends an HTTP request and asynchronously returns the response.
@@ skipping 27 matching lines @@
     });
   }
 
   /// Closes the client. This terminates all active connections. If a client
   /// remains unclosed, the Dart process may not terminate.
   void close() {
     if (_inner != null) _inner.close(force: true);
     _inner = null;
   }
 }