Remove currently deprecated functionality (#5433)

redbot/core/utils/mod.py

@@ -1,12 +1,10 @@
 import asyncio
-import warnings
 from datetime import timedelta
 from typing import List, Iterable, Union, TYPE_CHECKING, Dict
 
 import discord
 
 if TYPE_CHECKING:
-    from .. import Config
     from ..bot import Red
     from ..commands import Context
 
@@ -96,21 +94,6 @@ def get_audit_reason(author: discord.Member, reason: str = None, *, shorten: boo
     return audit_reason
 
 
-async def is_allowed_by_hierarchy(
-    bot: "Red", settings: "Config", guild: discord.Guild, mod: discord.Member, user: discord.Member
-):
-    warnings.warn(
-        "`is_allowed_by_hierarchy()` is deprecated since Red 3.4.1"
-        " and will be removed in the first minor release after 2020-11-31.",
-        DeprecationWarning,
-        stacklevel=2,
-    )
-    if not await settings.guild(guild).respect_hierarchy():
-        return True
-    is_special = mod == guild.owner or await bot.is_owner(mod)
-    return mod.top_role > user.top_role or is_special
-
-
 async def is_mod_or_superior(
     bot: "Red", obj: Union[discord.Message, discord.Member, discord.Role]
 ):