[Mac] Disable Mach IPC between renderers and cfprefsd.

BUG=306348

Review URL: https://codereview.chromium.org/148893005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253430 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed