Add grid/flex layout support for <fieldset>

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 2497 matching lines @@
 
 void LayoutObject::destroyAndCleanupAnonymousWrappers()
 {
     // If the tree is destroyed, there is no need for a clean-up phase.
     if (documentBeingDestroyed()) {
         destroy();
         return;
     }
 
     LayoutObject* destroyRoot = this;
-    for (LayoutObject* destroyRootParent = destroyRoot->parent(); destroyRootParent && destroyRootParent->isAnonymous(); destroyRoot = destroyRootParent, destroyRootParent = destroyRootParent->parent()) {
+    for (LayoutObject* destroyRootParent = destroyRoot->parent(); destroyRootParent && destroyRootParent->isAnonymous() && !destroyRootParent->parent()->createsAnonymousWrapper(); destroyRoot = destroyRootParent, destroyRootParent = destroyRootParent->parent()) {
+
         // Anonymous block continuations are tracked and destroyed elsewhere (see the bottom of LayoutBlock::removeChild)
         if (destroyRootParent->isLayoutBlockFlow() && toLayoutBlockFlow(destroyRootParent)->isAnonymousBlockContinuation())
             break;
         // A flow thread is tracked by its containing block. Whether its children are removed or not is irrelevant.
         if (destroyRootParent->isLayoutFlowThread())
             break;
 
         if (destroyRootParent->slowFirstChild() != destroyRoot || destroyRootParent->slowLastChild() != destroyRoot)
             break; // Need to keep the anonymous parent, since it won't become empty by the removal of this layoutObject.
     }
@@ skipping 702 matching lines @@
         const blink::LayoutObject* root = object1;
         while (root->parent())
             root = root->parent();
         root->showLayoutTreeAndMark(object1, "*", object2, "-", 0);
     } else {
         WTFLogAlways("%s", "Cannot showLayoutTree. Root is (nil)");
     }
 }
 
 #endif