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

test/cctest/heap/heap-utils.h

Index: test/cctest/heap/heap-utils.h
diff --git a/test/cctest/heap/heap-utils.h b/test/cctest/heap/heap-utils.h
index e03e6fa6e0461df12f6ec8a204a9975b782d09c8..f7739d4b0eb72fd0fcec9723bde0c5668173868d 100644
--- a/test/cctest/heap/heap-utils.h
+++ b/test/cctest/heap/heap-utils.h
@@ -40,10 +40,6 @@
 // Helper function that simulates a full old-space in the heap.
 void SimulateFullSpace(v8::internal::PagedSpace* space);
 
-void AbandonCurrentlyFreeMemory(PagedSpace* space);
-
-void GcAndSweep(Heap* heap, AllocationSpace space);
-
 }  // namespace heap
 }  // namespace internal
 }  // namespace v8