Remove unused IRealmFactory interface

osu.Game/Database/IRealmFactory.cs

@@ -1,20 +0,0 @@
-// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
-// See the LICENCE file in the repository root for full licence text.
-
-using Realms;
-
-namespace osu.Game.Database
-{
-    public interface IRealmFactory
-    {
-        /// <summary>
-        /// The main realm context, bound to the update thread.
-        /// </summary>
-        Realm Context { get; }
-
-        /// <summary>
-        /// Create a new realm context for use on the current thread.
-        /// </summary>
-        Realm CreateContext();
-    }
-}

osu.Game/Database/RealmContextFactory.cs

@@ -30,7 +30,7 @@ namespace osu.Game.Database
     /// <summary>
     /// A factory which provides both the main (update thread bound) realm context and creates contexts for async usage.
     /// </summary>
-    public class RealmContextFactory : IDisposable, IRealmFactory
+    public class RealmContextFactory : IDisposable
     {
         private readonly Storage storage;