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

sdk/lib/io/stdio.dart

Index: sdk/lib/io/stdio.dart
diff --git a/sdk/lib/io/stdio.dart b/sdk/lib/io/stdio.dart
index 5cad1f0c89139a4afa2d3b59d97e1ee575bbee70..e54d601a74c98ccefa7084e1432fc7ed8501df88 100644
--- a/sdk/lib/io/stdio.dart
+++ b/sdk/lib/io/stdio.dart
@@ -42,9 +42,7 @@ class _StdSink implements IOSink {
   void add(List<int> data) => _sink.add(data);
   void addError(AsyncError error) => _sink.addError(error);
   void writeCharCode(int charCode) => _sink.writeCharCode(charCode);
-  Future consume(Stream<List<int>> stream) => _sink.consume(stream);
   Future addStream(Stream<List<int>> stream) => _sink.addStream(stream);
-  Future writeStream(Stream<List<int>> stream) => _sink.writeStream(stream);
   Future close() => _sink.close();
   Future get done => _sink.done;
 }