stdlib/@python2: clean imports (#5453)

stdlib/@python2/wsgiref/handlers.pyi

@@ -1,7 +1,6 @@
-import sys
 from abc import abstractmethod
 from types import TracebackType
-from typing import IO, Callable, Dict, List, MutableMapping, Optional, Text, Tuple, Type
+from typing import IO, Callable, List, MutableMapping, Optional, Text, Tuple, Type
 
 from .headers import Headers
 from .types import ErrorStream, InputStream, StartResponse, WSGIApplication, WSGIEnvironment

stdlib/@python2/wsgiref/headers.pyi

@@ -1,4 +1,3 @@
-import sys
 from typing import List, Optional, Pattern, Tuple, overload
 
 _HeaderList = List[Tuple[str, str]]

stdlib/@python2/wsgiref/simple_server.pyi

@@ -1,4 +1,3 @@
-import sys
 from BaseHTTPServer import BaseHTTPRequestHandler, HTTPServer
 from typing import List, Optional, Type, TypeVar, overload
 

stdlib/@python2/wsgiref/util.pyi

@@ -1,4 +1,3 @@
-import sys
 from typing import IO, Any, Callable, Optional
 
 from .types import WSGIEnvironment

stdlib/@python2/wsgiref/validate.pyi

@@ -1,4 +1,3 @@
-import sys
 from _typeshed.wsgi import ErrorStream, InputStream, WSGIApplication
 from typing import Any, Callable, Iterable, Iterator, NoReturn, Optional