Stop working around issue 2644.

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:io';
 import 'dart:typed_data';
 import 'dart:utf';
@@ skipping 24 matching lines @@
 ///     mapToQuery({"foo": "bar", "baz": "bang"});
 ///     //=> "foo=bar&baz=bang"
 String mapToQuery(Map<String, String> map) {
   var pairs = <List<String>>[];
   map.forEach((key, value) =>
       pairs.add([Uri.encodeQueryComponent(key),
                  Uri.encodeQueryComponent(value)]));
   return pairs.map((pair) => "${pair[0]}=${pair[1]}").join("&");
 }
 
-/// Adds all key/value pairs from [source] to [destination], overwriting any
-/// pre-existing values.
-///
-///     var a = {"foo": "bar", "baz": "bang"};
-///     mapAddAll(a, {"baz": "zap", "qux": "quux"});
-///     a; //=> {"foo": "bar", "baz": "zap", "qux": "quux"}
-void mapAddAll(Map destination, Map source) =>
-  source.forEach((key, value) => destination[key] = value);
-
 /// Decodes a URL-encoded string. Unlike [Uri.decodeComponent], this includes
 /// replacing `+` with ` `.
 String urlDecode(String encoded) =>
   Uri.decodeComponent(encoded.replaceAll("+", " "));
 
 /// Like [String.split], but only splits on the first occurrence of the pattern.
 /// This will always return an array of two elements or fewer.
 ///
 ///     split1("foo,bar,baz", ","); //=> ["foo", "bar,baz"]
 ///     split1("foo", ","); //=> ["foo"]
@@ skipping 172 matching lines @@
 /// The return values of all [Future]s are discarded. Any errors will cause the
 /// iteration to stop and will be piped through the return value.
 Future forEachFuture(Iterable input, Future fn(element)) {
   var iterator = input.iterator;
   Future nextElement(_) {
     if (!iterator.moveNext()) return new Future.value();
     return fn(iterator.current).then(nextElement);
   }
   return nextElement(null);
 }