Consolidate the various sysctl-read rules we imported from 'system.sb' sandbox in Bug 179548 into our WebContent sandbox. This will allow us to tighten things down further than we could using the global sandbox. <rdar://problem/35367154>
Created attachment 326890 [details] Patch
Created attachment 326897 [details] Patch
Committed r224830: <https://trac.webkit.org/changeset/224830>