Rename unsubscribeOnError to cancelOnError.

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 e54d601a74c98ccefa7084e1432fc7ed8501df88..44088a31202778318346941bbb757d8d1f1d29b8 100644
--- a/sdk/lib/io/stdio.dart
+++ b/sdk/lib/io/stdio.dart
@@ -18,12 +18,12 @@ class _StdStream extends Stream<List<int>> {
   StreamSubscription<List<int>> listen(void onData(List<int> event),
                                        {void onError(AsyncError error),
                                         void onDone(),
-                                        bool unsubscribeOnError}) {
+                                        bool cancelOnError}) {
     return _stream.listen(
         onData,
         onError: onError,
         onDone: onDone,
-        unsubscribeOnError: unsubscribeOnError);
+        cancelOnError: cancelOnError);
   }
 }