Fix type warnings and remove unimplemented stuff from HttpClient interface.

sdk/lib/io/http_impl.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.
 
 part of dart.io;
 
 class _HttpIncoming
     extends Stream<List<int>> implements StreamSink<List<int>> {
   final int _transferLength;
   final Completer _dataCompleter = new Completer();
@@ skipping 296 matching lines @@
           return this;
         }
       });
     }
     // No credentials were found and the callback was not set.
     return new Future.immediate(this);
   }
 }
 
 
-class _HttpOutboundMessage<T> extends IOSink {
+abstract class _HttpOutboundMessage<T> extends IOSink {
   // Used to mark when the body should be written. This is used for HEAD
   // requests and in error handling.
   bool _ignoreBody = false;
 
   _HttpOutboundMessage(String protocolVersion, _HttpOutgoing outgoing)
       : super(outgoing),
         _outgoing = outgoing,
         headers = new _HttpHeaders(protocolVersion);
 
   int get contentLength => headers.contentLength;
   void set contentLength(int contentLength) {
     headers.contentLength = contentLength;
   }
 
   bool get persistentConnection => headers.persistentConnection;
-  bool set persistentConnection(bool p) {
+  void set persistentConnection(bool p) {
     headers.persistentConnection = p;
   }
 
   Future<T> consume(Stream<List<int>> stream) {
     _writeHeaders();
     if (_ignoreBody) return new Future.immediate(this);
     if (_chunked) {
       // Transform when chunked.
       stream = stream.transform(new _ChunkedTransformer());
     }
@@ skipping 711 matching lines @@
           return info.connection.send(uri,
                                       port,
                                       method.toUpperCase(),
                                       info.proxy.isDirect);
         });
   }
 
   Future<HttpClientRequest> _openUrlFromRequest(String method,
                                                 Uri uri,
                                                 _HttpClientRequest previous) {
-    return openUrl(method, uri).then((request) {
+    return openUrl(method, uri).then((_HttpClientRequest request) {
           // Only follow redirects if initial request did.
           request.followRedirects = previous.followRedirects;
           // Allow same number of redirects.
           request.maxRedirects = previous.maxRedirects;
           // Copy headers
           for (var header in previous.headers._headers.keys) {
             if (request.headers[header] == null) {
               request.headers.set(header, previous.headers[header]);
             }
           }
@@ skipping 409 matching lines @@
   Future<Socket> addStream(Stream<List<int>> stream) {
     return _socket.addStream(stream);
   }
 
   void addString(String string, [Encoding encoding = Encoding.UTF_8]) {
     return _socket.addString(string, encoding);
   }
 
   void destroy() => _socket.destroy();
   void add(List<int> data) => _socket.add(data);
-  Future<Socket> close() => _socket.close();
+  void close() => _socket.close();
 }
 
 
 class _AuthenticationScheme {
   static const UNKNOWN = const _AuthenticationScheme(-1);
   static const BASIC = const _AuthenticationScheme(0);
   static const DIGEST = const _AuthenticationScheme(1);
 
   const _AuthenticationScheme(this._scheme);
 
@@ skipping 95 matching lines @@
 
 
 class _RedirectInfo implements RedirectInfo {
   const _RedirectInfo(int this.statusCode,
                       String this.method,
                       Uri this.location);
   final int statusCode;
   final String method;
   final Uri location;
 }