Call PersistentHandleVisitor directly instead of using ObjectVisitor.

src/profiler/heap-snapshot-generator.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/profiler/heap-snapshot-generator.h"
 
 #include <utility>
 
 #include "src/api.h"
 #include "src/code-stubs.h"
@@ skipping 2179 matching lines @@
   }
 
   DisallowHeapAllocation no_allocation;
   for (int i = 0, l = enumerator.count(); i < l; ++i) {
     objects_tags_.SetTag(*enumerator.at(i), urls[i]);
   }
 
   DeleteArray(urls);
 }
 
-
-class GlobalHandlesExtractor : public ObjectVisitor {
+class GlobalHandlesExtractor : public PersistentHandleVisitor {
  public:
   explicit GlobalHandlesExtractor(NativeObjectsExplorer* explorer)
       : explorer_(explorer) {}
   ~GlobalHandlesExtractor() override {}
-  void VisitPointers(Object** start, Object** end) override { UNREACHABLE(); }
-  void VisitEmbedderReference(Object** p, uint16_t class_id) override {
-    explorer_->VisitSubtreeWrapper(p, class_id);
+  void VisitPersistentHandle(Persistent<Value>* value,
+                             uint16_t class_id) override {
+    Handle<Object> object = Utils::OpenPersistent(value);
+    explorer_->VisitSubtreeWrapper(object.location(), class_id);
   }
+
  private:
   NativeObjectsExplorer* explorer_;
 };
 
 
 class BasicHeapEntriesAllocator : public HeapEntriesAllocator {
  public:
   BasicHeapEntriesAllocator(
       HeapSnapshot* snapshot,
       HeapEntry::Type entries_type)
@@ skipping 915 matching lines @@
   for (int i = 1; i < sorted_strings.length(); ++i) {
     writer_->AddCharacter(',');
     SerializeString(sorted_strings[i]);
     if (writer_->aborted()) return;
   }
 }
 
 
 }  // namespace internal
 }  // namespace v8