Revert of "[heap] Fine-grained JSArrayBuffer tracking"

test/cctest/heap/heap-utils.cc

Index: test/cctest/heap/heap-utils.cc
diff --git a/test/cctest/heap/heap-utils.cc b/test/cctest/heap/heap-utils.cc
index 8abc5c3b5c63d2e863080effda3d2c0a69a2396a..e6daa454417ab5b78d87873e4420ea61b372522a 100644
--- a/test/cctest/heap/heap-utils.cc
+++ b/test/cctest/heap/heap-utils.cc
@@ -141,21 +141,6 @@
   space->ClearStats();
 }
 
-void AbandonCurrentlyFreeMemory(PagedSpace* space) {
-  space->EmptyAllocationInfo();
-  PageIterator pit(space);
-  while (pit.has_next()) {
-    pit.next()->MarkNeverAllocateForTesting();
-  }
-}
-
-void GcAndSweep(Heap* heap, AllocationSpace space) {
-  heap->CollectGarbage(space);
-  if (heap->mark_compact_collector()->sweeping_in_progress()) {
-    heap->mark_compact_collector()->EnsureSweepingCompleted();
-  }
-}
-
 }  // namespace heap
 }  // namespace internal
 }  // namespace v8