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The CFBundleBlocker's functionality is largely replaced (albeit without
an explicit allow-list) by code signing with library-validation and the
hardened runtime. Those code signing options also prohibit the program
text modification that mach_override performs, so it can be deleted.

Bug: 850193
Change-Id: Ieec7bf98d27f03a47140ac8abcf5e910db2eb01f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1675912Reviewed-by: Mark Mentovai <mark@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672268}