Unreviewed, rolling out r169001.
https://bugs.webkit.org/show_bug.cgi?id=133050

We can't expose the C SPI from WKWebView (Requested by
andersca on #webkit).

Reverted changeset:

"Need a way to get a WKPageRef from a WKWebView"
https://bugs.webkit.org/show_bug.cgi?id=133015
http://trac.webkit.org/changeset/169001

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@169012 268f45cc-cd09-0410-ab3c-d52691b4dbfc