It looks like there are no uses of the `DragLabelBorderYOffset` macro defined in DragImage.h, so we should drop it.
<rdar://problem/118680101>
Pull request: https://github.com/WebKit/WebKit/pull/20779
Committed 271025@main (9cb0043fb035): <https://commits.webkit.org/271025@main> Reviewed commits have been landed. Closing PR #20779 and removing active labels.