Replace ENABLE(ASSERT) with DCHECK_IS_ON().

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 2098 matching lines @@
   }
 
   setLogicalHeight(computedValues.m_extent);
   setLogicalTop(computedValues.m_position);
   setMarginBefore(computedValues.m_margins.m_before);
   setMarginAfter(computedValues.m_margins.m_after);
 
   return true;
 }
 
-#if ENABLE(ASSERT)
+#if DCHECK_IS_ON()
 void LayoutBlock::checkPositionedObjectsNeedLayout() {
   if (!gPositionedDescendantsMap)
     return;
 
   if (TrackedLayoutBoxListHashSet* positionedDescendantSet =
           positionedObjects()) {
     TrackedLayoutBoxListHashSet::const_iterator end =
         positionedDescendantSet->end();
     for (TrackedLayoutBoxListHashSet::const_iterator it =
              positionedDescendantSet->begin();
@@ skipping 70 matching lines @@
   }
 
   return availableHeight;
 }
 
 bool LayoutBlock::hasDefiniteLogicalHeight() const {
   return availableLogicalHeightForPercentageComputation() != LayoutUnit(-1);
 }
 
 }  // namespace blink