heap: make array buffer maps disjoint

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index a4ecdf7c79a55d913fe5d9b2eaaae261940eca8e..be5044380f584a7a0d82b7f3e584e7173e2f5310 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -1790,21 +1790,6 @@ class Heap {
   // Called on heap tear-down. Frees all remaining ArrayBuffer backing stores.
   void TearDownArrayBuffers();
 
-  // These correspond to the non-Helper versions.
-  void RegisterNewArrayBufferHelper(std::map<void*, size_t>& live_buffers,
-                                    void* data, size_t length);
-  void UnregisterArrayBufferHelper(
-      std::map<void*, size_t>& live_buffers,
-      std::map<void*, size_t>& not_yet_discovered_buffers, void* data);
-  void RegisterLiveArrayBufferHelper(
-      std::map<void*, size_t>& not_yet_discovered_buffers, void* data);
-  size_t FreeDeadArrayBuffersHelper(
-      Isolate* isolate, std::map<void*, size_t>& live_buffers,
-      std::map<void*, size_t>& not_yet_discovered_buffers);
-  void TearDownArrayBuffersHelper(
-      Isolate* isolate, std::map<void*, size_t>& live_buffers,
-      std::map<void*, size_t>& not_yet_discovered_buffers);
-
   // Record statistics before and after garbage collection.
   void ReportStatisticsBeforeGC();
   void ReportStatisticsAfterGC();