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The slots_ member was always misnamed, as it is really an array of
metadata _about_ slots, not the slots (pages) themselves. The
slot_metadata member variable would be clearer as 'metadata_addr' to
denote that it's an address. These renames are in anticipation of an
upcoming change that will make slots/metadata more distinct (no 1:1
mapping.)

Bug: 939142
Change-Id: I58e5f8035ea571fe7c0b0a4fb6bb0114580984e8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1507217
Commit-Queue: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
Auto-Submit: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638659}