Replace ENABLE(ASSERT) with DCHECK_IS_ON().

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

 /*
  * 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 Apple Inc.
  *               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
  * License as published by the Free Software Foundation; either
@@ skipping 295 matching lines @@
     return !style()->isLeftToRightDirection()
                ? logicalLeftOffsetForContent()
                : logicalWidth() - logicalRightOffsetForContent();
   }
 
   virtual LayoutUnit logicalLeftSelectionOffset(const LayoutBlock* rootBlock,
                                                 LayoutUnit position) const;
   virtual LayoutUnit logicalRightSelectionOffset(const LayoutBlock* rootBlock,
                                                  LayoutUnit position) const;
 
-#if ENABLE(ASSERT)
+#if DCHECK_IS_ON()
   void checkPositionedObjectsNeedLayout();
 #endif
 
   LayoutUnit availableLogicalHeightForPercentageComputation() const;
   bool hasDefiniteLogicalHeight() const;
 
  protected:
   bool recalcNormalFlowChildOverflowIfNeeded(LayoutObject*);
   bool recalcPositionedDescendantsOverflowAfterStyleChange();
 
@@ skipping 234 matching lines @@
   // TODO(lunalu): Temporary in order to ensure compatibility with existing
   // layout test results.
   virtual void adjustChildDebugRect(LayoutRect&) const {}
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutBlock, isLayoutBlock());
 
 }  // namespace blink
 
 #endif  // LayoutBlock_h