Remove non-beneficial condition

This condition does not appear to have any use. I cannot find any
reason for it and it only serves to make the code less clear.

Bug: None
Change-Id: If4a0dbca8bdd90ea4b65e7d8e0b55288fd8338da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2551773Reviewed-by: Adam Ettenberger <Adam.Ettenberger@microsoft.com>
Reviewed-by: Aaron Leventhal <aleventhal@chromium.org>
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#829670}

third_party/blink/renderer/modules/accessibility/ax_object_cache_impl.cc

@@ -552,9 +552,6 @@ AXObject* AXObjectCacheImpl::GetOrCreate(Node* node) {
     return GetOrCreate(node->GetLayoutObject());
   }
 
-  if (!LayoutTreeBuilderTraversal::Parent(*node))
-    return nullptr;
-
   if (IsA<HTMLHeadElement>(node))
     return nullptr;