Add wait to after sneding browser.close()

Author: ayjayt

choreographer/browser_async.py

@@ -179,8 +179,9 @@ async def _close(self) -> None:
             return
         except ChannelClosedError:
             _logger.debug("Can send browser.close on close channel")
-        await asyncio.sleep(0.3)
         await asyncio.to_thread(self._channel.close)
+        if await self._is_closed(wait=2):
+            return
 
         if await self._is_closed():
             _logger.debug("Browser is closed after closing channel")