Remove JSReceiver::GetPrototype and replace it with PrototypeIterator calls

src/heap-snapshot-generator.cc

Index: src/heap-snapshot-generator.cc
diff --git a/src/heap-snapshot-generator.cc b/src/heap-snapshot-generator.cc
index 6229386804b0361109178c73c482996dbd002d4e..f085622c2ad19325e547bc822cdd4d46cf1e8f10 100644
--- a/src/heap-snapshot-generator.cc
+++ b/src/heap-snapshot-generator.cc
@@ -1164,8 +1164,8 @@ void V8HeapExplorer::ExtractJSObjectReferences(
   ExtractPropertyReferences(js_obj, entry);
   ExtractElementReferences(js_obj, entry);
   ExtractInternalReferences(js_obj, entry);
-  SetPropertyReference(
-      obj, entry, heap_->proto_string(), js_obj->GetPrototype());
+  PrototypeIterator iter(heap_->isolate(), js_obj);
+  SetPropertyReference(obj, entry, heap_->proto_string(), iter.GetCurrent());
   if (obj->IsJSFunction()) {
     JSFunction* js_fun = JSFunction::cast(js_obj);
     Object* proto_or_map = js_fun->prototype_or_initial_map();