CurrentUser: remove #as method.

Replace with CurrentUser#scoped.

app/logical/current_user.rb

@@ -10,14 +10,4 @@ class CurrentUser < ActiveSupport::CurrentAttributes
       yield user
     end
   end
-
-  def self.as(user_or_id, &block)
-    if user_or_id.is_a?(String) || user_or_id.is_a?(Integer)
-      user = ::User.find(user_or_id)
-    else
-      user = user_or_id
-    end
-
-    scoped(user, &block)
-  end
 end