Just visit young array buffers during scavenge.

test/cctest/test-heap-profiler.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2622 matching lines @@
   const v8::HeapSnapshot* snapshot =
       heap_profiler->TakeHeapSnapshot(v8_str("snapshot"));
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   const v8::HeapGraphNode* arr1_obj =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "arr1");
   CHECK(arr1_obj);
   const v8::HeapGraphNode* arr1_buffer =
       GetProperty(arr1_obj, v8::HeapGraphEdge::kInternal, "buffer");
   CHECK(arr1_buffer);
-  const v8::HeapGraphNode* first_view =
-      GetProperty(arr1_buffer, v8::HeapGraphEdge::kWeak, "weak_first_view");
-  CHECK(first_view);
   const v8::HeapGraphNode* backing_store =
       GetProperty(arr1_buffer, v8::HeapGraphEdge::kInternal, "backing_store");
   CHECK(backing_store);
   CHECK_EQ(400, static_cast<int>(backing_store->GetShallowSize()));
 }
 
 
 static int GetRetainersCount(const v8::HeapSnapshot* snapshot,
                              const v8::HeapGraphNode* node) {
   int count = 0;
@@ skipping 169 matching lines @@
   map.AddRange(ToAddress(0x180), 0x80, 6U);
   map.AddRange(ToAddress(0x180), 0x80, 7U);
   CHECK_EQ(7u, map.GetTraceNodeId(ToAddress(0x180)));
   CHECK_EQ(5u, map.GetTraceNodeId(ToAddress(0x200)));
   CHECK_EQ(3u, map.size());
 
   map.Clear();
   CHECK_EQ(0u, map.size());
   CHECK_EQ(0u, map.GetTraceNodeId(ToAddress(0x400)));
 }