ImageBufferBackend::toBackendCoordinates is a redundant function Makes the code incorrect because to call the function, one needs a backend and some functions shouldn't be limited with that.
<rdar://problem/115051175>
Pull request: https://github.com/WebKit/WebKit/pull/17477
Pull request: https://github.com/WebKit/WebKit/pull/17479
Committed 267774@main (c102029b036a): <https://commits.webkit.org/267774@main> Reviewed commits have been landed. Closing PR #17479 and removing active labels.