remove references to tag subscriptions

app/logical/anonymous_user.rb

@@ -68,10 +68,6 @@ class AnonymousUser
     true
   end
 
-  def tag_subscriptions
-    []
-  end
-
   def favorite_tags
     nil
   end

app/logical/user_deletion.rb

@@ -21,7 +21,6 @@ class UserDeletion
     validate
     clear_user_settings
     remove_favorites
-    clear_tag_subscriptions
     clear_saved_searches
     rename
     reset_password
@@ -34,10 +33,6 @@ private
     ModAction.log("user ##{user.id} deleted")
   end
 
-  def clear_tag_subscriptions
-    TagSubscription.where(:creator_id => user.id).destroy_all
-  end
-
   def clear_saved_searches
     SavedSearch.where(user_id: user.id).destroy_all
   end