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In https://crrev.com/651373, the package_exists() implementation changed
but the comment did not reflect this change.

Change-Id: Ic13e7a3cef28a980ebd167af1bab31006bbf5b59
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2375928Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801469}