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base::SharedMemory, which is being deprecated, exposes a utilty
method GetHandleLimit() which needs to be moved somewhere.
process_metrics.h seems to be a more appropriate place for this
anyway over base::SharedMemory.

Bug: 795291
Change-Id: I1562cca6445c362654ba4a52195c0ec4d53757ff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1695284
Commit-Queue: Matthew Cary (CET) <mattcary@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676546}