Fix http input stream double close problem.

runtime/bin/stream_util.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 class _BaseDataInputStream {
   abstract int available();
 
   List<int> read([int len]) {
     if (_closeCallbackCalled || _scheduledCloseCallback != null) return null;
     int bytesToRead = available();
@@ skipping 64 matching lines @@
       _clientDataHandler();
     }
     _checkScheduleCallbacks();
   }
 
   void _closeReceived() {
     // Close indication has been received asynchronously. Perform the
     // 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();
     }
   }
 
   void _cancelScheduledDataCallback() {
     if (_scheduledDataCallback != null) {
       _scheduledDataCallback.cancel();
       _scheduledDataCallback = null;
     }
@@ skipping 103 matching lines @@
   void _reportError(e) {
     if (_onError != null) {
       _onError(e);
     } else {
       throw e;
     }
   }
 
   Function _onError;
 }