Revert of [heap] Move slot filtering logic into sweeper.

test/unittests/heap/slot-set-unittest.cc

Index: test/unittests/heap/slot-set-unittest.cc
diff --git a/test/unittests/heap/slot-set-unittest.cc b/test/unittests/heap/slot-set-unittest.cc
index c9b1464d670b48615407aaa7001669030ef342fd..d24ed1322b4042851cdde1da64611a340b94fc4b 100644
--- a/test/unittests/heap/slot-set-unittest.cc
+++ b/test/unittests/heap/slot-set-unittest.cc
@@ -101,21 +101,18 @@
   set.SetPageStart(0);
   uint32_t first = start == 0 ? 0 : start - kPointerSize;
   uint32_t last = end == Page::kPageSize ? end - kPointerSize : end;
-  for (const auto mode :
-       {SlotSet::FREE_EMPTY_BUCKETS, SlotSet::KEEP_EMPTY_BUCKETS}) {
-    for (uint32_t i = first; i <= last; i += kPointerSize) {
-      set.Insert(i);
-    }
-    set.RemoveRange(start, end, mode);
-    if (first != start) {
-      EXPECT_TRUE(set.Lookup(first));
-    }
-    if (last == end) {
-      EXPECT_TRUE(set.Lookup(last));
-    }
-    for (uint32_t i = start; i < end; i += kPointerSize) {
-      EXPECT_FALSE(set.Lookup(i));
-    }
+  for (uint32_t i = first; i <= last; i += kPointerSize) {
+    set.Insert(i);
+  }
+  set.RemoveRange(start, end, SlotSet::FREE_EMPTY_BUCKETS);
+  if (first != start) {
+    EXPECT_TRUE(set.Lookup(first));
+  }
+  if (last == end) {
+    EXPECT_TRUE(set.Lookup(last));
+  }
+  for (uint32_t i = start; i < end; i += kPointerSize) {
+    EXPECT_FALSE(set.Lookup(i));
   }
 }
 
@@ -137,13 +134,10 @@
   }
   SlotSet set;
   set.SetPageStart(0);
-  for (const auto mode :
-       {SlotSet::FREE_EMPTY_BUCKETS, SlotSet::KEEP_EMPTY_BUCKETS}) {
-    set.Insert(Page::kPageSize / 2);
-    set.RemoveRange(0, Page::kPageSize, mode);
-    for (uint32_t i = 0; i < Page::kPageSize; i += kPointerSize) {
-      EXPECT_FALSE(set.Lookup(i));
-    }
+  set.Insert(Page::kPageSize / 2);
+  set.RemoveRange(0, Page::kPageSize, SlotSet::FREE_EMPTY_BUCKETS);
+  for (uint32_t i = 0; i < Page::kPageSize; i += kPointerSize) {
+    EXPECT_FALSE(set.Lookup(i));
   }
 }