Rip out dart:io from pkg/http wherever possible.

pkg/http/lib/src/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 utils;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:typed_data';
 
@@ skipping 44 matching lines @@
   if (index == -1) return [toSplit];
   return [
     toSplit.substring(0, index),
     toSplit.substring(index + pattern.length)
   ];
 }
 
 /// Returns the [Encoding] that corresponds to [charset]. Returns [fallback] if
 /// [charset] is null or if no [Encoding] was found that corresponds to
 /// [charset].
-Encoding encodingForCharset(
-    String charset, [Encoding fallback = LATIN1]) {
+Encoding encodingForCharset(String charset, [Encoding fallback = LATIN1]) {
   if (charset == null) return fallback;
   var encoding = Encoding.getByName(charset);
   return encoding == null ? fallback : encoding;
 }
 
 
 /// Returns the [Encoding] that corresponds to [charset]. Throws a
 /// [FormatException] if no [Encoding] was found that corresponds to [charset].
 /// [charset] may not be null.
 Encoding requiredEncodingForCharset(String charset) {
@@ skipping 116 matching lines @@
 }
 
 /// Configures [future] so that its result (success or exception) is passed on
 /// to [completer].
 void chainToCompleter(Future future, Completer completer) {
   future.then(completer.complete, onError: completer.completeError);
 }
 
 /// Like [Future.sync], but wraps the Future in [Chain.track] as well.
 Future syncFuture(callback()) => Chain.track(new Future.sync(callback));