Fix http input stream double close problem.

runtime/bin/stream_util.dart

Index: runtime/bin/stream_util.dart
diff --git a/runtime/bin/stream_util.dart b/runtime/bin/stream_util.dart
index a20e72b1b1e92272ccc847ca9975ad9d2c3c6130..2a55cc43b831299e0a186180af559448049be3ac 100644
--- a/runtime/bin/stream_util.dart
+++ b/runtime/bin/stream_util.dart
@@ -82,10 +82,8 @@ class _BaseDataInputStream {
     // close callback now if all data has been delivered.
     _streamMarkedClosed = true;
     if (available() == 0) {
-      if (_clientCloseHandler !== null) {
-        _clientCloseHandler();
-        _closeCallbackCalled = true;
-      }
+      _closeCallbackCalled = true;
+      if (_clientCloseHandler !== null) _clientCloseHandler();
     } else {
       _checkScheduleCallbacks();
     }