Replace ENABLE(ASSERT) with DCHECK_IS_ON().

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

 /*
  * Copyright (C) 2012 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 121 matching lines @@
     if (object->containingBlock()->flowThreadContainingBlock() == flowThread) {
       // This out-of-flow object is still part of the flow thread, because its
       // containing block (probably relatively positioned) is part of the flow
       // thread.
       break;
     }
     object = object->nextInPreOrderAfterChildren(flowThread);
   }
   if (!object)
     return nullptr;
-#if ENABLE(ASSERT)
+#if DCHECK_IS_ON()
   // Make sure that we didn't stumble into an inner multicol container.
   for (LayoutObject* walker = object->parent(); walker && walker != flowThread;
        walker = walker->parent())
     ASSERT(!isMultiColumnContainer(*walker));
 #endif
   return object;
 }
 
 // Find the previous layout object that has the multicol container in its
 // containing block chain, skipping nested multicol containers.
@@ skipping 28 matching lines @@
       object = ancestor;
       ASSERT(ancestor->isDescendantOf(flowThread));
       continue;  // Continue on the outside of the inner flow thread.
     }
     // We're inside something that's out-of-flow. Keep looking upwards and
     // backwards in the tree.
     object = object->previousInPreOrder(flowThread);
   }
   if (!object || object == flowThread)
     return nullptr;
-#if ENABLE(ASSERT)
+#if DCHECK_IS_ON()
   // Make sure that we didn't stumble into an inner multicol container.
   for (LayoutObject* walker = object->parent(); walker && walker != flowThread;
        walker = walker->parent())
     ASSERT(!isMultiColumnContainer(*walker));
 #endif
   return object;
 }
 
 static LayoutObject* firstLayoutObjectInSet(LayoutMultiColumnSet* multicolSet) {
   LayoutBox* sibling = multicolSet->previousSiblingMultiColumnBox();
@@ skipping 1167 matching lines @@
     const {
   return MultiColumnLayoutState(m_lastSetWorkedOn);
 }
 
 void LayoutMultiColumnFlowThread::restoreMultiColumnLayoutState(
     const MultiColumnLayoutState& state) {
   m_lastSetWorkedOn = state.columnSet();
 }
 
 }  // namespace blink