Remove reliance on typing-extensions, only required for Python 3.7 compatibility.

Author: jaraco

importlib_metadata/_compat.py

@@ -5,14 +5,7 @@
 from typing import Union
 
 
-__all__ = ['install', 'NullFinder', 'Protocol']
-
-
-try:
-    from typing import Protocol
-except ImportError:  # pragma: no cover
-    # Python 3.7 compatibility
-    from typing_extensions import Protocol  # type: ignore
+__all__ = ['install', 'NullFinder']
 
 
 def install(cls):

importlib_metadata/_meta.py

@@ -1,4 +1,4 @@
-from ._compat import Protocol
+from typing import Protocol
 from typing import Any, Dict, Iterator, List, Optional, TypeVar, Union, overload
 
 

tests/_path.py

@@ -1,14 +1,9 @@
-# from jaraco.path 3.6
+# from jaraco.path 3.7
 
 import functools
 import pathlib
-from typing import Dict, Union
-
-try:
-    from typing import Protocol, runtime_checkable
-except ImportError:  # pragma: no cover
-    # Python 3.7
-    from typing_extensions import Protocol, runtime_checkable  # type: ignore
+from typing import Dict, Protocol, Union
+from typing import runtime_checkable
 
 
 class Symlink(str):