Update Mac memory code references

The Mac malloc interceptor relies on internals of macOS.
Update those internals and links to the 10.15 versions.

There is no actual difference in the code that is relied on,
but the code references were to 10.7 and 10.9.

Bug: none
Change-Id: I335007a338c4d3ce4e8297c325ac765a384510f0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2376886
Commit-Queue: Avi Drissman <avi@chromium.org>
Commit-Queue: Mark Mentovai <mark@chromium.org>
Auto-Submit: Avi Drissman <avi@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801644}
GitOrigin-RevId: 994f22b51a586390c36b5713812baeae1e96262a
2 files changed