Mac: Fix compile/build errors due to Chromium update

git-svn-id: http://chromiumembedded.googlecode.com/svn/trunk/cef3@1468 5089003a-bbd8-11dd-ad1f-f1f9622dbc98
Fix WebKit scripts path.

git-svn-id: http://chromiumembedded.googlecode.com/svn/trunk/cef3@1469 5089003a-bbd8-11dd-ad1f-f1f9622dbc98