Avoid crashing for cases when cell/row parenting is not like a real table.

third_party/WebKit/Source/core/layout/LayoutBox.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 2143 matching lines @@
 
     if (ancestor == this)
         return true;
 
     bool ancestorSkipped;
     bool filterOrReflectionSkipped;
     LayoutObject* container = this->container(ancestor, &ancestorSkipped, &filterOrReflectionSkipped);
     LayoutBox* tableRowContainer = nullptr;
     // Skip table row because cells and rows are in the same coordinate space
     // (see below, however for more comments about when |ancestor| is the table row).
-    if (container->isTableRow()) {
-        DCHECK(isTableCell() && parentBox() == container);
+    // The second and third conditionals below are to skip cases where content has display: table-row or display: table-cell but is not
+    // parented like a cell/row combo.
+    if (container->isTableRow() && isTableCell() && parentBox() == container) {
         if (container != ancestor)
             container = container->parent();
         else
             tableRowContainer = toLayoutBox(container);
     }
     if (!container)
         return true;
 
     if (filterOrReflectionSkipped)
         inflateVisualRectForReflectionAndFilterUnderContainer(rect, *container, ancestor);
@@ skipping 2698 matching lines @@
     LayoutRect rect = frameRect();
 
     LayoutBlock* block = containingBlock();
     if (block)
         block->adjustChildDebugRect(rect);
 
     return rect;
 }
 
 } // namespace blink