[API] remove (deprecated) hidden properties.

src/profiler/heap-snapshot-generator.cc

Index: src/profiler/heap-snapshot-generator.cc
diff --git a/src/profiler/heap-snapshot-generator.cc b/src/profiler/heap-snapshot-generator.cc
index 26630099a867831cfba5c439e822fb14ffbd49b6..e67acef268f1fdc340425ac07f59182287f3232c 100644
--- a/src/profiler/heap-snapshot-generator.cc
+++ b/src/profiler/heap-snapshot-generator.cc
@@ -1583,14 +1583,8 @@ void V8HeapExplorer::ExtractPropertyReferences(JSObject* js_obj, int entry) {
           int field_offset =
               field_index.is_inobject() ? field_index.offset() : -1;
 
-          if (k != heap_->hidden_properties_symbol()) {
-            SetDataOrAccessorPropertyReference(details.kind(), js_obj, entry, k,
-                                               value, NULL, field_offset);
-          } else {
-            TagObject(value, "(hidden properties)");
-            SetInternalReference(js_obj, entry, "hidden_properties", value,
-                                 field_offset);
-          }
+          SetDataOrAccessorPropertyReference(details.kind(), js_obj, entry, k,
+                                             value, NULL, field_offset);
           break;
         }
         case kDescriptor:
@@ -1610,11 +1604,6 @@ void V8HeapExplorer::ExtractPropertyReferences(JSObject* js_obj, int entry) {
         DCHECK(dictionary->ValueAt(i)->IsPropertyCell());
         PropertyCell* cell = PropertyCell::cast(dictionary->ValueAt(i));
         Object* value = cell->value();
-        if (k == heap_->hidden_properties_symbol()) {
-          TagObject(value, "(hidden properties)");
-          SetInternalReference(js_obj, entry, "hidden_properties", value);
-          continue;
-        }
         PropertyDetails details = cell->property_details();
         SetDataOrAccessorPropertyReference(details.kind(), js_obj, entry,
                                            Name::cast(k), value);
@@ -1627,11 +1616,6 @@ void V8HeapExplorer::ExtractPropertyReferences(JSObject* js_obj, int entry) {
       Object* k = dictionary->KeyAt(i);
       if (dictionary->IsKey(k)) {
         Object* value = dictionary->ValueAt(i);
-        if (k == heap_->hidden_properties_symbol()) {
-          TagObject(value, "(hidden properties)");
-          SetInternalReference(js_obj, entry, "hidden_properties", value);
-          continue;
-        }
         PropertyDetails details = dictionary->DetailsAt(i);
         SetDataOrAccessorPropertyReference(details.kind(), js_obj, entry,
                                            Name::cast(k), value);