Revert of "[heap] Add more tasks for parallel compaction"

test/cctest/test-spaces.cc

Index: test/cctest/test-spaces.cc
diff --git a/test/cctest/test-spaces.cc b/test/cctest/test-spaces.cc
index 7e684150e17fc38b59a895ac7da0e172824403e1..a744bb79a7d4658acd5209158b021a4095d8c48e 100644
--- a/test/cctest/test-spaces.cc
+++ b/test/cctest/test-spaces.cc
@@ -458,8 +458,8 @@
   CHECK(allocator->SetUp(heap->MaxReserved(), heap->MaxExecutableSize()));
   TestMemoryAllocatorScope test_scope(isolate, allocator);
 
-  CompactionSpaceCollection* collection = new CompactionSpaceCollection(heap);
-  CompactionSpace* compaction_space = collection->Get(OLD_SPACE);
+  CompactionSpace* compaction_space =
+      new CompactionSpace(heap, OLD_SPACE, NOT_EXECUTABLE);
   CHECK(compaction_space != NULL);
   CHECK(compaction_space->SetUp());
 
@@ -498,11 +498,17 @@
   // We expect two pages to be reachable from old_space in the end.
   const intptr_t kExpectedOldSpacePagesAfterMerge = 2;
 
+  Object* chunk =
+      old_space->AllocateRawUnaligned(static_cast<int>(rest)).ToObjectChecked();
   CHECK_EQ(old_space->CountTotalPages(), kExpectedInitialOldSpacePages);
+  CHECK(chunk != nullptr);
+  CHECK(chunk->IsHeapObject());
+
   CHECK_EQ(compaction_space->CountTotalPages(), 0);
   CHECK_EQ(compaction_space->Capacity(), 0);
   // Make the rest of memory available for compaction.
-  old_space->DivideMemory(&collection, 1, rest);
+  compaction_space->AddExternalMemory(HeapObject::cast(chunk)->address(),
+                                      static_cast<int>(rest));
   CHECK_EQ(compaction_space->CountTotalPages(), 0);
   CHECK_EQ(compaction_space->Capacity(), rest);
   while (num_rest_objects-- > 0) {
@@ -519,7 +525,7 @@
   old_space->MergeCompactionSpace(compaction_space);
   CHECK_EQ(old_space->CountTotalPages(), kExpectedOldSpacePagesAfterMerge);
 
-  delete collection;
+  delete compaction_space;
   delete old_space;
 
   allocator->TearDown();