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

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

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 917 matching lines @@
   Vector<LineContext> lineContexts;
   LayoutUnit sumFlexBaseSize;
   double totalFlexGrow;
   double totalFlexShrink;
   double totalWeightedFlexShrink;
   LayoutUnit sumHypotheticalMainSize;
 
   PaintLayerScrollableArea::PreventRelayoutScope preventRelayoutScope(
       layoutScope);
 
-  // Fieldsets need to find their legend and position it inside the border of
-  // the object. The legend then gets skipped during normal layout. It
-  // doesn't get included in the normal layout process but is instead skipped.
-  LayoutObject* childToExclude =
-      layoutSpecialExcludedChild(relayoutChildren, layoutScope);
 
   // Set up our master list of flex items. All of the rest of the algorithm
   // should work off this list of a subset.
   // TODO(cbiesinger): That second part is not yet true.
   ChildLayoutType layoutType = relayoutChildren ? ForceLayout : LayoutIfNeeded;
   Vector<FlexItem> allItems;
   m_orderIterator.first();
   for (LayoutBox* child = m_orderIterator.currentChild(); child;
        child = m_orderIterator.next()) {
-    if (childToExclude == child)
-      continue;  // Skip this child, since it will be positioned by the
-                 // specialized subclass (fieldsets runs).
 
     if (child->isOutOfFlowPositioned()) {
       // Out-of-flow children are not flex items, so we skip them here.
       prepareChildForPositionedLayout(*child);
       continue;
     }
 
     allItems.append(constructFlexItem(*child, layoutType));
   }
 
@@ skipping 1214 matching lines @@
       LayoutUnit originalOffset =
           lineContexts[lineNumber].crossAxisOffset - crossAxisStartEdge;
       LayoutUnit newOffset =
           contentExtent - originalOffset - lineCrossAxisExtent;
       adjustAlignmentForChild(*flexItem.box, newOffset - originalOffset);
     }
   }
 }
 
 }  // namespace blink