Make ifdefs consistent in WebKit/Source/core/

third_party/WebKit/Source/platform/graphics/paint/DisplayItem.h

Index: third_party/WebKit/Source/platform/graphics/paint/DisplayItem.h
diff --git a/third_party/WebKit/Source/platform/graphics/paint/DisplayItem.h b/third_party/WebKit/Source/platform/graphics/paint/DisplayItem.h
index 69d04570510f9311d02c16038e32b708bf2da1ce..9f197bc38ab8640912d460ea10da6151763bb086 100644
--- a/third_party/WebKit/Source/platform/graphics/paint/DisplayItem.h
+++ b/third_party/WebKit/Source/platform/graphics/paint/DisplayItem.h
@@ -336,7 +336,7 @@ class PLATFORM_EXPORT DisplayItem {
   virtual bool isBegin() const { return false; }
   virtual bool isEnd() const { return false; }
 
-#if DCHECK_IS_ON()
+#ifdef NDEBUG
   virtual bool isEndAndPairedWith(DisplayItem::Type otherType) const {
     return false;
   }
@@ -418,7 +418,7 @@ class PLATFORM_EXPORT PairedEndDisplayItem : public DisplayItem {
                        size_t derivedSize)
       : DisplayItem(client, type, derivedSize) {}
 
-#if ENABLE(ASSERT)
+#ifdef NDEBUG
   bool isEndAndPairedWith(DisplayItem::Type otherType) const override = 0;
 #endif