FrameView has some methods in its header (updateIsVisuallyNonEmpty and updateSignificantRenderedTextMilestoneIfNeeded) that used to be part of the visually non-empty logic, but are no longer implemented. Delete them.
Created attachment 383760 [details]
Comment on attachment 383760 [details]
Clearing flags on attachment: 383760
Committed r252552: <https://trac.webkit.org/changeset/252552>
All reviewed patches have been landed. Closing bug.