Revert of [heap] Optimize ArrayBuffer tracking (patchset #5 id:80001 of https://codereview.chromium.org/2107443002/ )

Reason for revert:
Seems to break GPU bots

Original issue's description:
> [heap] Optimize ArrayBuffer tracking
>
> With the current approach we only need to track using an unordered set as we can
> still access the backing store pointer and length by the time we free the
> backing store.
>
> BUG=chromium:619491, chromium:611688
> LOG=N
> R=ulan@chromium.org
>
> Committed: https://crrev.com/8d2ae27808f047ca8b8f90e63a9c8735321d2ad0
> Cr-Commit-Position: refs/heads/master@{#37318}

TBR=ulan@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:619491, chromium:611688

Review-Url: https://codereview.chromium.org/2105273002
Cr-Commit-Position: refs/heads/master@{#37358}