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In an upcoming change, I split the GuardedPageAllocator into two
objects. I'm moving these methods into the GuardedPageAllocator because
SlotMetadata lives in the base object but these methods should not.

Bug: 896019
Change-Id: Ia98e966ce6cc8aa843bcaa4ce322c1b355e508a1
Reviewed-on: https://chromium-review.googlesource.com/c/1341062
Commit-Queue: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609352}