Replace ENABLE(ASSERT) with DCHECK_IS_ON().

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

Index: third_party/WebKit/Source/platform/heap/PersistentNode.h
diff --git a/third_party/WebKit/Source/platform/heap/PersistentNode.h b/third_party/WebKit/Source/platform/heap/PersistentNode.h
index 6fbc02a2bf4fbd6d680518ea8fcaec5e3fbe50bc..ee726283aa09231e152a1f25e7c69f0590c55fe4 100644
--- a/third_party/WebKit/Source/platform/heap/PersistentNode.h
+++ b/third_party/WebKit/Source/platform/heap/PersistentNode.h
@@ -23,7 +23,7 @@ class PersistentNode final {
  public:
   PersistentNode() : m_self(nullptr), m_trace(nullptr) { ASSERT(isUnused()); }
 
-#if ENABLE(ASSERT)
+#if DCHECK_IS_ON()
   ~PersistentNode() {
     // If you hit this assert, it means that the thread finished
     // without clearing persistent handles that the thread created.
@@ -214,7 +214,7 @@ class CrossThreadPersistentRegion final {
 
   void tracePersistentNodes(Visitor* visitor) {
 // If this assert triggers, you're tracing without being in a LockScope.
-#if ENABLE(ASSERT)
+#if DCHECK_IS_ON()
     DCHECK(m_mutex.locked());
 #endif
     m_persistentRegion->tracePersistentNodes(