Revert of [heap] Re-enable black allocation when finalizing marking. (patchset...

Revert of [heap] Re-enable black allocation when finalizing marking. (patchset #1 id:1 of https://codereview.chromium.org/2202993002/ )

Reason for revert:
Crashes on tree.

Original issue's description:
> [heap] Re-enable black allocation when finalizing marking.
>
> BUG=chromium:630386
> LOG=n
>
> Committed: https://crrev.com/2c75cfd731e11daa649faf2e91cbb84767b11f8e
> Cr-Commit-Position: refs/heads/master@{#38240}

TBR=ulan@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/2204593005
Cr-Commit-Position: refs/heads/master@{#38243}

src/flag-definitions.h

@@ -741,7 +741,7 @@ DEFINE_INT(min_progress_during_incremental_marking_finalization, 32,
            "least this many unmarked objects")
 DEFINE_INT(max_incremental_marking_finalization_rounds, 3,
            "at most try this many times to finalize 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,