WebKit Golden-hammer-ectomy completed; nightly Safari downloads

Hey all.

The removal of the golden hammer from WebKit just landed:
https://trac.webkit.org/changeset/198870

On a related note, if you go to https://webkit.org/nightly/archives, you
can download nightly builds of Safari. You'll notice that each build has
a revision number beginning with 'r'. At the time of this writing, the
most recent revision available as a downloadable Safari is 198849.

As you may have noticed, the URL associated with my commit ends with a
similar looking number. Thus it should be possible for anyone with a Mac
to wait for a revision number greater than 198870 to show up on
https://webkit.org/nightly/archives, download it, and examine the
de-hammerified implementation using the Apple Accessibility Inspector
which comes with XCode and/or try things with VoiceOver.

I mention this just in case anyone is motivated or has a need to do so,
without having to build anything themselves. And also because there was
a question at today's meeting regarding whether or not the committed
implementation (and subsequent fixes) were in Safari.

Please let me know if you have any questions. Thanks!
--joanie