test: drop white-box async orphan-callback check

The sync subprocess test already covers the user-visible warning.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 358aa828-ed44-482a-8a83-91d435d25b38

Author: Skn0tt

tests/async/test_asyncio.py

@@ -68,24 +68,6 @@ def exception_handler(loop: asyncio.AbstractEventLoop, context: Dict) -> None:
     asyncio.get_running_loop().set_exception_handler(None)
 
 
-async def test_should_not_orphan_callback_on_non_serializable_params(
-    browser_name: str,
-    launch_arguments: Dict,
-) -> None:
-    # Regression test for https://github.com/microsoft/playwright-python/issues/3165.
-    # A failed transport.send must not leave a ProtocolCallback in connection._callbacks
-    # (cleanup would later set_exception on it → "Future exception was never retrieved").
-    async with async_playwright() as p:
-        browser = await p[browser_name].launch(**launch_arguments)
-        page = await browser.new_page()
-        connection = page._impl_obj._connection
-        before = set(connection._callbacks)
-        with pytest.raises(TypeError, match="JSON serializable"):
-            await page.locator("asdf").highlight(style=object())  # type: ignore
-        assert set(connection._callbacks) == before
-        await browser.close()
-
-
 async def test_async_playwright_stop_multiple_times() -> None:
     playwright = await async_playwright().start()
     await playwright.stop()