Replace ENABLE(ASSERT) with DCHECK_IS_ON().

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

Index: third_party/WebKit/Source/platform/heap/MarkingVisitorImpl.h
diff --git a/third_party/WebKit/Source/platform/heap/MarkingVisitorImpl.h b/third_party/WebKit/Source/platform/heap/MarkingVisitorImpl.h
index 4b2f56586ef2a20ed9dcb64dc4c2de7709f10298..bd58304a7fae4bad93bd7488ed1154674d0873b1 100644
--- a/third_party/WebKit/Source/platform/heap/MarkingVisitorImpl.h
+++ b/third_party/WebKit/Source/platform/heap/MarkingVisitorImpl.h
@@ -80,7 +80,7 @@ class MarkingVisitorImpl {
         const_cast<void*>(closure), iterationCallback, iterationDoneCallback);
   }
 
-#if ENABLE(ASSERT)
+#if DCHECK_IS_ON()
   inline bool weakTableRegistered(const void* closure) {
     return toDerived()->heap().weakTableRegistered(closure);
   }
@@ -110,7 +110,7 @@ class MarkingVisitorImpl {
     HeapObjectHeader* header = HeapObjectHeader::fromPayload(objectPointer);
     if (header->isMarked())
       return false;
-#if ENABLE(ASSERT)
+#if DCHECK_IS_ON()
     toDerived()->markNoTracing(objectPointer);
 #else
     // Inline what the above markNoTracing() call expands to,