Revert of Allow compaction when incremental marking is on. (patchset #1 id:1 of https://codereview.chromium.org/1014263002/)

Reason for revert:
It seems to cause crbug/469146.

Original issue's description:
> Allow compaction when incremental marking is on.
>
> BUG=chromium:450824
> LOG=NO
>
> Committed: https://crrev.com/92f96e4e9a527fcb085b68f81ee14b26acdd4719
> Cr-Commit-Position: refs/heads/master@{#27267}

TBR=hpayer@chromium.org,ulan@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:450824

Review URL: https://codereview.chromium.org/1026813002

Cr-Commit-Position: refs/heads/master@{#27345}