Remove .writeStream, .consume and rewrite IOSink to correctly implement a (sane) well-defined behav…

sdk/lib/io/socket.dart

Index: sdk/lib/io/socket.dart
diff --git a/sdk/lib/io/socket.dart b/sdk/lib/io/socket.dart
index ac3444c1e68b586d880014fca9387cdc3d913b92..48c864064f295f6c3bd1cb12ba3b6f322a3c8be8 100644
--- a/sdk/lib/io/socket.dart
+++ b/sdk/lib/io/socket.dart
@@ -212,8 +212,7 @@ abstract class RawSocket implements Stream<RawSocketEvent> {
  * both a [Stream] and a [IOSink] interface, making it ideal for
  * using together with other [Stream]s.
  */
-abstract class Socket implements Stream<List<int>>,
-                                 IOSink<Socket> {
+abstract class Socket implements Stream<List<int>>, IOSink {
   /**
    * Creats a new socket connection to the host and port and returns a [Future]
    * that will complete with either a [Socket] once connected or an error