Handle the case of Stream.take(0) better.

sdk/lib/async/stream_pipe.dart

Index: sdk/lib/async/stream_pipe.dart
diff --git a/sdk/lib/async/stream_pipe.dart b/sdk/lib/async/stream_pipe.dart
index d26b0c5f64c86fc97c1df3c06a879e81c9c480fd..caf94a1f02b570392891ac028440ac61d9a5859e 100644
--- a/sdk/lib/async/stream_pipe.dart
+++ b/sdk/lib/async/stream_pipe.dart
@@ -326,6 +326,9 @@ class _TakeStream<T> extends _ForwardingStream<T, T> {
       Function onError,
       void onDone(),
       bool cancelOnError) {
+    if (_count == 0) {
+      return new _DoneSubscription<T>(onDone);
+    }
     return new _StateStreamSubscription<T>(
         this, onData, onError, onDone, cancelOnError, _count);
   }