Fix incorrect usage of AnyStr (#1215)

* Fix incorrect usage of AnyStr

- sqlite3 was using Union[bytes, AnyStr], which doesn't make sense
- The urllib functions I changed accept either bytes or str for their "safe"
  argument
- Also added supports for PathLike to pstats
- Remove some unused imports of AnyStr

* pstats: python 2 accepts unicode

stdlib/2and3/pstats.pyi

@@ -1,9 +1,15 @@
 from profile import Profile
 from cProfile import Profile as cProfile
-from typing import Any, AnyStr, Dict, IO, Iterable, List, Text, Tuple, TypeVar, Union, overload
+import os
+import sys
+from typing import Any, Dict, IO, Iterable, List, Text, Tuple, TypeVar, Union, overload
 
 _Selector = Union[str, float, int]
 _T = TypeVar('_T', bound='Stats')
+if sys.version_info >= (3, 6):
+    _Path = Union[bytes, Text, os.PathLike[Any]]
+else:
+    _Path = Union[bytes, Text]
 
 class Stats:
     def __init__(self: _T, __arg: Union[None, str, Text, Profile, cProfile] = ...,
@@ -13,7 +19,7 @@ class Stats:
     def load_stats(self, arg: Union[None, str, Text, Profile, cProfile]) -> None: ...
     def get_top_level_stats(self) -> None: ...
     def add(self: _T, *arg_list: Union[None, str, Text, Profile, cProfile, _T]) -> _T: ...
-    def dump_stats(self, filename: AnyStr) -> None: ...
+    def dump_stats(self, filename: _Path) -> None: ...
     def get_sort_arg_defs(self) -> Dict[str, Tuple[Tuple[Tuple[int, int], ...], str]]: ...
     @overload
     def sort_stats(self: _T, field: int) -> _T: ...