clean python 3 specific stuff from stdlib/@python2 stubs (#5451)

stdlib/@python2/wsgiref/handlers.pyi

@@ -11,9 +11,6 @@ _exc_info = Tuple[Optional[Type[BaseException]], Optional[BaseException], Option
 
 def format_date_time(timestamp: Optional[float]) -> str: ...  # undocumented
 
-if sys.version_info >= (3, 2):
-    def read_environ() -> Dict[str, str]: ...
-
 class BaseHandler:
     wsgi_version: Tuple[int, int]  # undocumented
     wsgi_multithread: bool

stdlib/@python2/wsgiref/headers.pyi

@@ -6,16 +6,12 @@ _HeaderList = List[Tuple[str, str]]
 tspecials: Pattern[str]  # undocumented
 
 class Headers:
-    if sys.version_info < (3, 5):
-        def __init__(self, headers: _HeaderList) -> None: ...
-    else:
-        def __init__(self, headers: Optional[_HeaderList] = ...) -> None: ...
+    def __init__(self, headers: _HeaderList) -> None: ...
     def __len__(self) -> int: ...
     def __setitem__(self, name: str, val: str) -> None: ...
     def __delitem__(self, name: str) -> None: ...
     def __getitem__(self, name: str) -> Optional[str]: ...
-    if sys.version_info < (3,):
-        def has_key(self, name: str) -> bool: ...
+    def has_key(self, name: str) -> bool: ...
     def __contains__(self, name: str) -> bool: ...
     def get_all(self, name: str) -> List[str]: ...
     @overload
@@ -25,7 +21,5 @@ class Headers:
     def keys(self) -> List[str]: ...
     def values(self) -> List[str]: ...
     def items(self) -> _HeaderList: ...
-    if sys.version_info >= (3,):
-        def __bytes__(self) -> bytes: ...
     def setdefault(self, name: str, value: str) -> str: ...
     def add_header(self, _name: str, _value: Optional[str], **_params: Optional[str]) -> None: ...

stdlib/@python2/wsgiref/simple_server.pyi

@@ -1,14 +1,10 @@
 import sys
+from BaseHTTPServer import BaseHTTPRequestHandler, HTTPServer
 from typing import List, Optional, Type, TypeVar, overload
 
 from .handlers import SimpleHandler
 from .types import ErrorStream, StartResponse, WSGIApplication, WSGIEnvironment
 
-if sys.version_info >= (3, 0):
-    from http.server import BaseHTTPRequestHandler, HTTPServer
-else:
-    from BaseHTTPServer import BaseHTTPRequestHandler, HTTPServer
-
 server_version: str  # undocumented
 sys_version: str  # undocumented
 software_version: str  # undocumented

stdlib/@python2/wsgiref/util.pyi

@@ -10,10 +10,7 @@ class FileWrapper:
     def __init__(self, filelike: IO[bytes], blksize: int = ...) -> None: ...
     def __getitem__(self, key: Any) -> bytes: ...
     def __iter__(self) -> FileWrapper: ...
-    if sys.version_info >= (3, 0):
-        def __next__(self) -> bytes: ...
-    else:
-        def next(self) -> bytes: ...
+    def next(self) -> bytes: ...
 
 def guess_scheme(environ: WSGIEnvironment) -> str: ...
 def application_uri(environ: WSGIEnvironment) -> str: ...

stdlib/@python2/wsgiref/validate.pyi

@@ -9,12 +9,8 @@ def validator(application: WSGIApplication) -> WSGIApplication: ...
 class InputWrapper:
     input: InputStream
     def __init__(self, wsgi_input: InputStream) -> None: ...
-    if sys.version_info >= (3, 0):
-        def read(self, size: int) -> bytes: ...
-        def readline(self, size: int = ...) -> bytes: ...
-    else:
-        def read(self, size: int = ...) -> bytes: ...
-        def readline(self) -> bytes: ...
+    def read(self, size: int = ...) -> bytes: ...
+    def readline(self) -> bytes: ...
     def readlines(self, hint: int = ...) -> bytes: ...
     def __iter__(self) -> Iterable[bytes]: ...
     def close(self) -> NoReturn: ...
@@ -44,9 +40,6 @@ class IteratorWrapper:
     check_start_response: Optional[bool]
     def __init__(self, wsgi_iterator: Iterator[bytes], check_start_response: Optional[bool]) -> None: ...
     def __iter__(self) -> IteratorWrapper: ...
-    if sys.version_info >= (3, 0):
-        def __next__(self) -> bytes: ...
-    else:
-        def next(self) -> bytes: ...
+    def next(self) -> bytes: ...
     def close(self) -> None: ...
     def __del__(self) -> None: ...