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

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index 246d389b88dc97ddf6ea61dc5f1ea621f96e571d..027dcf79554a9dafe8bcf3af7d659d6048899644 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -820,16 +820,6 @@
     amount_of_external_allocated_memory_ += delta;
   }
 
-  void update_amount_of_external_allocated_freed_memory(intptr_t freed) {
-    amount_of_external_allocated_memory_freed_.Increment(freed);
-  }
-
-  void account_amount_of_external_allocated_freed_memory() {
-    amount_of_external_allocated_memory_ -=
-        amount_of_external_allocated_memory_freed_.Value();
-    amount_of_external_allocated_memory_freed_.SetValue(0);
-  }
-
   void DeoptMarkedAllocationSites();
 
   bool DeoptMaybeTenuredAllocationSites() {
@@ -1364,6 +1354,10 @@
   void RegisterNewArrayBuffer(JSArrayBuffer* buffer);
   void UnregisterArrayBuffer(JSArrayBuffer* buffer);
 
+  inline ArrayBufferTracker* array_buffer_tracker() {
+    return array_buffer_tracker_;
+  }
+
   // ===========================================================================
   // Allocation site tracking. =================================================
   // ===========================================================================
@@ -1999,8 +1993,6 @@
 
   // Caches the amount of external memory registered at the last global gc.
   int64_t amount_of_external_allocated_memory_at_last_global_gc_;
-
-  base::AtomicNumber<intptr_t> amount_of_external_allocated_memory_freed_;
 
   // This can be calculated directly from a pointer to the heap; however, it is
   // more expedient to get at the isolate directly from within Heap methods.
@@ -2239,6 +2231,8 @@
   bool deserialization_complete_;
 
   StrongRootsList* strong_roots_list_;
+
+  ArrayBufferTracker* array_buffer_tracker_;
 
   // The depth of HeapIterator nestings.
   int heap_iterator_depth_;