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The current implementation for Mac crashes, since /proc/ doesn't exist and thus
the path being searched for. This leads to attempting to create a string of
length 0.

This adds in Mac specific logic for fetching this information.

BUG=chromium:773183

Change-Id: I57bc2530ee79a51c0caad42ec31f640f73c7a7d4
Reviewed-on: https://chromium-review.googlesource.com/740344Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
Cr-Commit-Position: refs/heads/master@{#513288}