Revert "Create sandbox::SeatbeltExtension to dynamically expand the Mac sandbox policy."

This reverts commit fa1f0b26ababc0ee9156619d25aa7adb39bd706d.

Reason for revert: Causing build failure on Mac official builder:
https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Fchromium.chrome%2FGoogle_Chrome_Mac%2F26445%2F%2B%2Frecipes%2Fsteps%2Fcompile%2F0%2Fstdout

Original change's description:
> Create sandbox::SeatbeltExtension to dynamically expand the Mac sandbox policy.
> 
> Sandbox policy extensions can be issued for resources in a trusted process,
> which generates a token that may be passed over Mojo IPC. The receiving process
> can then consume the token to be granted access to the resource. Currently only
> file-read extensions are permitted.
> 
> Bug: 510604
> Change-Id: Iaa92c48c120e051c5df72602d09329ebe84ea317
> Reviewed-on: https://chromium-review.googlesource.com/685583
> Reviewed-by: Greg Kerr <kerrnel@chromium.org>
> Reviewed-by: Ken Rockot <rockot@chromium.org>
> Reviewed-by: Justin Schuh <jschuh@chromium.org>
> Commit-Queue: Robert Sesek <rsesek@chromium.org>
> Commit-Queue: Justin Schuh <jschuh@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#505819}

TBR=jschuh@chromium.org,rockot@chromium.org,kerrnel@chromium.org,rsesek@chromium.org

Change-Id: I943e64875b7d83d61d85ad3f4626d8abdc44e553
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 510604
Reviewed-on: https://chromium-review.googlesource.com/696302
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#505841}

CrOS-Libchrome-Original-Commit: 2d3424262ea732b35d66479ea0224405d417af9b
1 file changed
tree: 15cf7b1125c2c74523336eb3423e6b62ffa5eb26
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/