asyncio: remove overly specific protocols (#10984)

The _warn parameter to these methods is just there to work around
some finalization issues and should never be used by users. In
addition, these protocols are out of date (the "stacklevel" argument
is not used by current CPython main). I don't think we gain anything
by trying to maintain these protocol definitions.

stdlib/asyncio/proactor_events.pyi

@@ -1,19 +1,13 @@
 import sys
 from collections.abc import Mapping
 from socket import socket
-from typing import Any, ClassVar, Protocol
+from typing import Any, ClassVar
 from typing_extensions import Literal
 
 from . import base_events, constants, events, futures, streams, transports
 
 __all__ = ("BaseProactorEventLoop",)
 
-if sys.version_info >= (3, 8):
-    class _WarnCallbackProtocol(Protocol):
-        def __call__(
-            self, message: str, category: type[Warning] | None = ..., stacklevel: int = ..., source: Any | None = ...
-        ) -> object: ...
-
 class _ProactorBasePipeTransport(transports._FlowControlMixin, transports.BaseTransport):
     def __init__(
         self,
@@ -24,10 +18,7 @@ class _ProactorBasePipeTransport(transports._FlowControlMixin, transports.BaseTr
         extra: Mapping[Any, Any] | None = None,
         server: events.AbstractServer | None = None,
     ) -> None: ...
-    if sys.version_info >= (3, 8):
-        def __del__(self, _warn: _WarnCallbackProtocol = ...) -> None: ...
-    else:
-        def __del__(self) -> None: ...
+    def __del__(self) -> None: ...
 
 class _ProactorReadPipeTransport(_ProactorBasePipeTransport, transports.ReadTransport):
     if sys.version_info >= (3, 10):

stdlib/asyncio/unix_events.pyi

@@ -84,13 +84,6 @@ if sys.platform != "win32":
     DefaultEventLoopPolicy = _UnixDefaultEventLoopPolicy
 
     if sys.version_info >= (3, 8):
-        from typing import Protocol
-
-        class _Warn(Protocol):
-            def __call__(
-                self, message: str, category: type[Warning] | None = ..., stacklevel: int = ..., source: Any | None = ...
-            ) -> object: ...
-
         class MultiLoopChildWatcher(AbstractChildWatcher):
             def is_active(self) -> bool: ...
             def close(self) -> None: ...
@@ -109,7 +102,7 @@ if sys.platform != "win32":
             def __exit__(
                 self, exc_type: type[BaseException] | None, exc_val: BaseException | None, exc_tb: types.TracebackType | None
             ) -> None: ...
-            def __del__(self, _warn: _Warn = ...) -> None: ...
+            def __del__(self) -> None: ...
             def add_child_handler(self, pid: int, callback: Callable[..., object], *args: Any) -> None: ...
             def remove_child_handler(self, pid: int) -> bool: ...
             def attach_loop(self, loop: AbstractEventLoop | None) -> None: ...

stdlib/asyncio/windows_utils.pyi

@@ -2,16 +2,12 @@ import subprocess
 import sys
 from collections.abc import Callable
 from types import TracebackType
-from typing import Any, AnyStr, Protocol
+from typing import Any, AnyStr
 from typing_extensions import Literal, Self
 
 if sys.platform == "win32":
     __all__ = ("pipe", "Popen", "PIPE", "PipeHandle")
 
-    class _WarnFunction(Protocol):
-        def __call__(
-            self, message: str, category: type[Warning] = ..., stacklevel: int = ..., source: PipeHandle = ...
-        ) -> object: ...
     BUFSIZE: Literal[8192]
     PIPE = subprocess.PIPE
     STDOUT = subprocess.STDOUT
@@ -19,11 +15,7 @@ if sys.platform == "win32":
 
     class PipeHandle:
         def __init__(self, handle: int) -> None: ...
-        if sys.version_info >= (3, 8):
-            def __del__(self, _warn: _WarnFunction = ...) -> None: ...
-        else:
-            def __del__(self) -> None: ...
-
+        def __del__(self) -> None: ...
         def __enter__(self) -> Self: ...
         def __exit__(self, t: type[BaseException] | None, v: BaseException | None, tb: TracebackType | None) -> None: ...
         @property