Replace ENABLE(ASSERT) with DCHECK_IS_ON().

third_party/WebKit/Source/platform/heap/Visitor.h

 /*
  * Copyright (C) 2013 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 361 matching lines @@
   // if objects pointed to are alive it is crucial that the object
   // pointed to belong to the same thread as the object receiving
   // the weak callback. Since other threads have been resumed the
   // mark bits are not valid for objects from other threads.
   virtual void registerWeakMembers(const void*, const void*, WeakCallback) = 0;
   using VisitorHelper<Visitor>::registerWeakMembers;
 
   virtual void registerWeakTable(const void*,
                                  EphemeronCallback,
                                  EphemeronCallback) = 0;
-#if ENABLE(ASSERT)
+#if DCHECK_IS_ON()
   virtual bool weakTableRegistered(const void*) = 0;
 #endif
 
   virtual bool ensureMarked(const void*) = 0;
 
   virtual void registerMovingObjectReference(MovableReference*) = 0;
 
   virtual void registerMovingObjectCallback(MovableReference,
                                             MovingObjectCallback,
                                             void*) = 0;
 
   virtual void registerWeakCellWithCallback(void**, WeakCallback) = 0;
 
  protected:
   Visitor(ThreadState*, VisitorMarkingMode);
 
  private:
   static Visitor* fromHelper(VisitorHelper<Visitor>* helper) {
     return static_cast<Visitor*>(helper);
   }
 };
 
 }  // namespace blink
 
 #endif  // Visitor_h