Make a few types in werkzeug more compatible with base types (#730)

* Make a few types in werkzeug more compatible with base types

* Keyword arguments to __delitem__ were private to implementation so can be left out

third_party/3/werkzeug/datastructures.pyi

@@ -141,7 +141,7 @@ class Headers(Mapping):
     def keys(self, lower=False): ...
     def values(self): ...
     def extend(self, iterable): ...
-    def __delitem__(self, key, _index_operation=True): ...
+    def __delitem__(self, key): ...
     def remove(self, key): ...
     def pop(self, **kwargs): ...
     def popitem(self): ...
@@ -161,7 +161,7 @@ class Headers(Mapping):
     def __copy__(self): ...
 
 class ImmutableHeadersMixin:
-    def __delitem__(self, key, **kwargs): ...
+    def __delitem__(self, key): ...
     def __setitem__(self, key, value): ...
     set = ...  # type: Any
     def add(self, *args, **kwargs): ...

third_party/3/werkzeug/wrappers.pyi

@@ -133,7 +133,7 @@ class ETagResponseMixin:
     def add_etag(self, overwrite=False, weak=False): ...
     def set_etag(self, etag, weak=False): ...
     def get_etag(self): ...
-    def freeze(self, no_etag=False): ...
+    def freeze(self, *, no_etag=False): ...
     accept_ranges = ...  # type: Any
     content_range = ...  # type: Any