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- Allow reading the directory contents of ~/Library/Preferences and
  ~/Library/Preferences/ByHost
- Allow reading of all com.apple.driver* plists in
  ~/Library/Preferences/...
- Allow reading /Library/Preferences/com.apple.security.plist to read
  the global trust settings
- Allow sysctl-read hw.busfrequency_max
- Deny access to a new macOS 11 UsageTrackingAgent Mach service

Bug: 1126350
Change-Id: I0be9a9f8a1830dbfac4486f9c21e05a6e5d336d7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2453900Reviewed-by: Greg Kerr <kerrnel@chromium.org>
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814379}