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

tests/standalone/io/socket_exception_test.dart

Index: tests/standalone/io/socket_exception_test.dart
diff --git a/tests/standalone/io/socket_exception_test.dart b/tests/standalone/io/socket_exception_test.dart
index a6ea31a0a469ad91f36d62e1de1f6a325c33699a..c82f3fbb314809d508e10c64442fdef122510977 100644
--- a/tests/standalone/io/socket_exception_test.dart
+++ b/tests/standalone/io/socket_exception_test.dart
@@ -89,7 +89,7 @@ class SocketExceptionTest {
         Expect.isFalse(wrongExceptionCaught);
         try {
           List<int> buffer = new List<int>(10);
-          client.writeBytes(buffer);
+          client.add(buffer);
         } on StateError catch (ex) {
           exceptionCaught = true;
         } catch (ex) {
@@ -122,7 +122,7 @@ class SocketExceptionTest {
       });
       Socket.connect("127.0.0.1", server.port).then((client) {
         client.listen((data) {}, onDone: server.close);
-        client.writeBytes(new List.filled(1024 * 1024, 0));
+        client.add(new List.filled(1024 * 1024, 0));
         client.destroy();
       });
     });
@@ -144,7 +144,7 @@ class SocketExceptionTest {
               Expect.equals(SIZE, count);
               server.close();
             });
-        client.writeBytes(new List.filled(SIZE, 0));
+        client.add(new List.filled(SIZE, 0));
         client.close();
         // Start piping now.
         completer.complete(null);
@@ -175,7 +175,7 @@ class SocketExceptionTest {
               Expect.isTrue(errors <= 1);
               server.close();
             });
-        client.writeBytes(new List.filled(SIZE, 0));
+        client.add(new List.filled(SIZE, 0));
         // Destroy other socket now.
         completer.complete(null);
         var port = new ReceivePort();
@@ -200,7 +200,7 @@ class SocketExceptionTest {
       Socket.connect("127.0.0.1", server.port).then((client) {
         const int SIZE = 1024 * 1024;
         int errors = 0;
-        client.writeBytes(new List.filled(SIZE, 0));
+        client.add(new List.filled(SIZE, 0));
         client.close();
         client.done.catchError((error) {
           server.close();