Fix Windows debug assertion when cancelling pending i/o

runtime/bin/eventhandler_win.cc

Index: runtime/bin/eventhandler_win.cc
diff --git a/runtime/bin/eventhandler_win.cc b/runtime/bin/eventhandler_win.cc
index 2cecd77f1c56280d3f9d3bd4a65f0cef1b3f0d93..f9887128c49ef4dae66c19b26a38a1b51555da7b 100644
--- a/runtime/bin/eventhandler_win.cc
+++ b/runtime/bin/eventhandler_win.cc
@@ -149,7 +149,7 @@ void Handle::Close() {
     // If the handle uses synchronous I/O (e.g. stdin), cancel any pending
     // operation before closing the handle, so the read thread is not blocked.
     BOOL result = CancelIoEx(handle_, NULL);
-    ASSERT(result);
+    ASSERT(result || (GetLastError() == ERROR_NOT_FOUND));
   }
   MonitorLocker ml(monitor_);
   if (!IsClosing()) {