[5.7] Remove unused method

[staudenmeir]

#19631 removed the method call but not the method itself.

[GrahamCampbell]

This may not be unused, since it's protected. People may be calling this in their apps. It seems like a pretty useful method.

[mfn]

This may not be unused, since it's protected. People may be calling this in their apps. It seems like a pretty useful method.

It's targeting the next release so it could be mention in an upgrade.

But having methods around in the framework which aren't used in the framework is… weird. Probably there are more, but still.

👍 for removing. If someone needs it, he/she can get it.

[jmarcher]

👎 For deleting methods in immediate releases, I believe we should deprecate methods/attributes/helper functions first for one release and then delete the method on the following release.