Revert of [heap] Enable black allocation when finalizing marking. (patchset #3...

Revert of [heap] Enable black allocation when finalizing marking. (patchset #3 id:40001 of https://codereview.chromium.org/2440943002/ )

Reason for revert:
Seems to block roll:
https://codereview.chromium.org/2569133002/

Original issue's description:
> [heap] Enable black allocation when finalizing marking.
>
> BUG=chromium:630386
>
> Committed: https://crrev.com/a98d971412a5c32967bbef4b77b9d2658055ff1c
> Cr-Commit-Position: refs/heads/master@{#41655}

TBR=ulan@chromium.org,hpayer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:630386

Review-Url: https://codereview.chromium.org/2567353002
Cr-Commit-Position: refs/heads/master@{#41665}

src/flag-definitions.h

@@ -749,7 +749,7 @@ DEFINE_INT(max_incremental_marking_finalization_rounds, 3,
            "at most try this many times to finalize incremental marking")
 DEFINE_BOOL(minor_mc, false, "perform young generation mark compact GCs")
 DEFINE_NEG_IMPLICATION(minor_mc, incremental_marking)
-DEFINE_BOOL(black_allocation, true, "use black allocation")
+DEFINE_BOOL(black_allocation, false, "use black allocation")
 DEFINE_BOOL(concurrent_sweeping, true, "use concurrent sweeping")
 DEFINE_BOOL(parallel_compaction, true, "use parallel compaction")
 DEFINE_BOOL(parallel_pointer_update, true,