Remove StreamSink(replaced by EventSink) and make IOSink extend EventSink.

With this change 'writeBytes' was renamed to 'add'.

BUG=

Review URL: https://codereview.chromium.org//14150002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@21275 260f80e4-7a28-3924-810f-c04153c831b5

lib/src/safe_http_server.dart

@@ -131,7 +131,7 @@ class _HttpResponseWrapper implements HttpResponse {
   List<Cookie> get cookies => _inner.cookies;
   Future<Socket> detachSocket() => _inner.detachSocket();
   HttpConnectionInfo get connectionInfo => _inner.connectionInfo;
-  void writeBytes(List<int> data) => _inner.writeBytes(data);
+  void add(List<int> data) => _inner.add(data);
   Future<HttpResponse> consume(Stream<List<int>> stream) =>
     _inner.consume(stream);
   Future<HttpResponse> addStream(Stream<List<int>> stream) =>

test/test_pub.dart

@@ -94,7 +94,7 @@ void serve([List<d.Descriptor> contents]) {
             new ByteStream(stream).toBytes().then((data) {
               response.statusCode = 200;
               response.contentLength = data.length;
-              response.writeBytes(data);
+              response.add(data);
               response.close();
             }).catchError((e) {
               response.statusCode = 404;