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

tests/standalone/io/http_client_request_test.dart

Index: tests/standalone/io/http_client_request_test.dart
diff --git a/tests/standalone/io/http_client_request_test.dart b/tests/standalone/io/http_client_request_test.dart
index 7d77c032a8dd77dbfeec1da0b49804596640f73d..a9434d31781e2a12eeb3e7ba75c39f0ebf8464d9 100644
--- a/tests/standalone/io/http_client_request_test.dart
+++ b/tests/standalone/io/http_client_request_test.dart
@@ -48,7 +48,7 @@ void testBadResponseAdd() {
   testClientRequest((request) {
     var port = new ReceivePort();
     request.contentLength = 0;
-    request.writeBytes([0]);
+    request.add([0]);
     request.close();
     request.done.catchError((error) {
       port.close();
@@ -59,8 +59,8 @@ void testBadResponseAdd() {
   testClientRequest((request) {
     var port = new ReceivePort();
     request.contentLength = 5;
-    request.writeBytes([0, 0, 0]);
-    request.writeBytes([0, 0, 0]);
+    request.add([0, 0, 0]);
+    request.add([0, 0, 0]);
     request.close();
     request.done.catchError((error) {
       port.close();
@@ -71,9 +71,9 @@ void testBadResponseAdd() {
   testClientRequest((request) {
     var port = new ReceivePort();
     request.contentLength = 0;
-    request.writeBytes(new Uint8List(64 * 1024));
-    request.writeBytes(new Uint8List(64 * 1024));
-    request.writeBytes(new Uint8List(64 * 1024));
+    request.add(new Uint8List(64 * 1024));
+    request.add(new Uint8List(64 * 1024));
+    request.add(new Uint8List(64 * 1024));
     request.close();
     request.done.catchError((error) {
       port.close();
@@ -96,7 +96,7 @@ void testBadResponseClose() {
   testClientRequest((request) {
     var port = new ReceivePort();
     request.contentLength = 5;
-    request.writeBytes([0]);
+    request.add([0]);
     request.close();
     request.done.catchError((error) {
       port.close();