Early return on null AXObjectCache() rather than DCHECK

Bug: 1132674
Change-Id: Ifdd4e607626b87c122ffc0b32a05b45ced7d8b0a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2434736
Auto-Submit: Aaron Leventhal <aleventhal@chromium.org>
Commit-Queue: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813664}

third_party/blink/renderer/modules/exported/web_ax_object.cc

@@ -1663,10 +1663,8 @@ WebAXObject WebAXObject::FromWebDocumentFocused(
 // static
 void WebAXObject::UpdateLayout(const WebDocument& web_document) {
   const Document* document = web_document.ConstUnwrap<Document>();
-  if (!document || !document->View())
+  if (!document || !document->View() || !document->ExistingAXObjectCache())
     return;
-  DCHECK(document->View());
-  DCHECK(document->ExistingAXObjectCache());
   if (document->NeedsLayoutTreeUpdate() || document->View()->NeedsLayout() ||
       document->Lifecycle().GetState() <
           DocumentLifecycle::kCompositingAssignmentsClean ||