Remove all uses of FindSafari

Remove all uses of FindSafari

It isn't really needed anymore.

Fixes <http://webkit.org/b/68626>.

Reviewed by Darin Adler.

* Scripts/old-run-webkit-tests: Moved read/writeRegistryString from here to webkitdirs.pm.

* Scripts/run-webkit-nightly.cmd: Removed. This used to be used to launch nightly builds of
WebKit, but now we use WebKit.exe for that.

* Scripts/webkitdirs.pm:
(installedSafariPath): Changed to use readRegistryString instead of invoking FindSafari to
do the same thing.

(readRegistryString):
(writeRegistryString):
Moved here from old-run-webkit-tests.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@95733 268f45cc-cd09-0410-ab3c-d52691b4dbfc