What?

This PR is a follow up to #61387 - I missed a reference to source in the theme json class in INDIRECT_PROPERTIES_METADATA. Whoops!

The changes were first added in #59454.

The deleted line is not yet in Core, and the changes are already reflected in the latest 6.6 backport PR:

• Background block supports: add support for top-level styles in theme.json wordpress-develop#6482

Why?

Janitorial

How?

DELETE

Testing Instructions

The CI tests should pass.

If you're feeling up to it, you could test that there are no regressions to site wide background images in the side editor/frontend.

Here is some test json!

{
	"$schema": "../../schemas/json/theme.json",
	"version": 2,
	"settings": {
		"appearanceTools": true
	},
	"styles": {
		"background": {
			"backgroundImage": {
				"url": "https://images.pexels.com/photos/22484288/pexels-photo-22484288/free-photo-of-the-circular-stone-terraces-of-the-inca-ruins.jpeg?auto=compress&cs=tinysrgb&w=1260&h=750&dpr=2"
			},
			"backgroundSize": "contain"
		}
	}
}