Make Cocoa and Nicosia implementations inherit from the base class and move the common code there.
Pull request: https://github.com/WebKit/WebKit/pull/5324
Committed 255724@main (8df9660de3fc): <https://commits.webkit.org/255724@main> Reviewed commits have been landed. Closing PR #5324 and removing active labels.
<rdar://problem/101328872>