Remove accidental addition of new stream API in dart:io.

runtime/bin/process_patch.dart

Index: runtime/bin/process_patch.dart
diff --git a/runtime/bin/process_patch.dart b/runtime/bin/process_patch.dart
index fc5f72b3d0c4bb3a8628abba6f05bb62fb9f8786..edc29e294c144f62518e7a32dd1fdb5dc0226fe6 100644
--- a/runtime/bin/process_patch.dart
+++ b/runtime/bin/process_patch.dart
@@ -256,24 +256,6 @@ class _ProcessImpl extends NativeFieldWrapperClass1 implements Process {
     return _kill(this, signal._signalNumber);
   }
 
-  void add(List<int> data) {
-    stdin.write(data);
-  }
-
-  void close() {
-    stdin.close();
-  }
-
-  void signalError(ASyncError error) {
-    // TODO(ajohnsen): close?
-  }
-
-  Stream<List<int>> get stdoutStream
-    => new _InputStreamController(stdout).stream;
-
-  Stream<List<int>> get stderrStream
-    => new _InputStreamController(stderr).stream;
-
   bool _kill(Process p, int signal) native "Process_Kill";
 
   void set onExit(void callback(int exitCode)) {