Fix some warnings in pub and pkg packages.

utils/pub/safe_http_server.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.
 
 library safe_http_server;
 
 import 'dart:async';
 import 'dart:io';
 import 'dart:uri';
 
@@ skipping 117 matching lines @@
 
   HttpHeaders get headers => _inner.headers;
   List<Cookie> get cookies => _inner.cookies;
   Future<Socket> detachSocket() => _inner.detachSocket();
   HttpConnectionInfo get connectionInfo => _inner.connectionInfo;
   void add(List<int> data) => _inner.add(data);
   Future<HttpResponse> addStream(Stream<List<int>> stream) =>
     _inner.addStream(stream);
   Future close() => _inner.close();
   void write(Object obj) => _inner.write(obj);
-  void writeAll(Iterable objects) => _inner.writeAll(objects);
+  void writeAll(Iterable objects, [String separator = ""]) =>
+    _inner.writeAll(objects, separator);
   void writeCharCode(int charCode) => _inner.writeCharCode(charCode);
   void writeln([Object obj = ""]) => _inner.writeln(obj);
+  void addError(error) => _inner.addError(error);
 }