Revert commit# 415577 "Add grid/flex layout support for <fieldset>"

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc.
  *               All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. 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 338 matching lines @@
 }
 
 void LayoutBlock::removeLeftoverAnonymousBlock(LayoutBlock* child) {
   ASSERT(child->isAnonymousBlock());
   ASSERT(!child->childrenInline());
   ASSERT(child->parent() == this);
 
   if (child->continuation())
     return;
 
-  if (isFieldset())
-    return;
-
   // Promote all the leftover anonymous block's children (to become children of
   // this block instead). We still want to keep the leftover block in the tree
   // for a moment, for notification purposes done further below (flow threads
   // and grids).
   child->moveAllChildrenTo(this, child->nextSibling());
 
   // Remove all the information in the flow thread associated with the leftover
   // anonymous block.
   child->removeFromLayoutFlowThread();
 
@@ skipping 1614 matching lines @@
 LayoutBlock* LayoutBlock::createAnonymousWithParentAndDisplay(
     const LayoutObject* parent,
     EDisplay display) {
   // FIXME: Do we need to convert all our inline displays to block-type in the
   // anonymous logic ?
   EDisplay newDisplay;
   LayoutBlock* newBox = nullptr;
   if (display == EDisplay::Flex || display == EDisplay::InlineFlex) {
     newBox = LayoutFlexibleBox::createAnonymous(&parent->document());
     newDisplay = EDisplay::Flex;
-  } else if (display == EDisplay::Grid || display == EDisplay::InlineGrid) {
-    newBox = LayoutGrid::createAnonymous(&parent->document());
-    newDisplay = EDisplay::Grid;
   } else {
     newBox = LayoutBlockFlow::createAnonymous(&parent->document());
     newDisplay = EDisplay::Block;
   }
 
   RefPtr<ComputedStyle> newStyle =
       ComputedStyle::createAnonymousStyleWithDisplay(parent->styleRef(),
                                                      newDisplay);
   parent->updateAnonymousChildStyle(*newBox, *newStyle);
   newBox->setStyle(newStyle.release());
@@ skipping 198 matching lines @@
   }
 
   return availableHeight;
 }
 
 bool LayoutBlock::hasDefiniteLogicalHeight() const {
   return availableLogicalHeightForPercentageComputation() != LayoutUnit(-1);
 }
 
 }  // namespace blink