Make ifdefs consistent in WebKit/Source/core/

third_party/WebKit/Source/core/dom/Node.h

Index: third_party/WebKit/Source/core/dom/Node.h
diff --git a/third_party/WebKit/Source/core/dom/Node.h b/third_party/WebKit/Source/core/dom/Node.h
index d632977be583a3d57dc2cf833d54fecce476aa6c..c8c88cc2faffa868d89265997720c0fcfdaf3485 100644
--- a/third_party/WebKit/Source/core/dom/Node.h
+++ b/third_party/WebKit/Source/core/dom/Node.h
@@ -663,7 +663,7 @@ class CORE_EXPORT Node : public EventTarget {
   // Tracing--rename it to something indicative.
   String debugName() const;
 
-#ifndef NDEBUG
+#if DCHECK_IS_ON()
   String toString() const;
   String toTreeStringForThis() const;
   String toFlatTreeStringForThis() const;
@@ -1018,7 +1018,7 @@ CORE_EXPORT std::ostream& operator<<(std::ostream&, const Node*);
 
 }  // namespace blink
 
-#ifndef NDEBUG
+#if DCHECK_IS_ON()
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showNode(const blink::Node*);
 void showTree(const blink::Node*);