Remove V8_USE_OLD_STYLE_PERSISTENT_HANDLE_VISITORS.

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index a41445d82f313c3ab05d5b52e5deef8741a17d8c..28a63f092efb5a7831ccd5a891a9cffddbf4f655 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -223,7 +223,6 @@ class WeakReferenceCallbacks {
 
 
 #define V8_USE_UNSAFE_HANDLES
-#define V8_USE_OLD_STYLE_PERSISTENT_HANDLE_VISITORS
 
 /**
  * An object reference managed by the v8 garbage collector.
@@ -4125,13 +4124,8 @@ class V8EXPORT ExternalResourceVisitor {  // NOLINT
 class V8EXPORT PersistentHandleVisitor {  // NOLINT
  public:
   virtual ~PersistentHandleVisitor() {}
-#ifdef V8_USE_OLD_STYLE_PERSISTENT_HANDLE_VISITORS
-  virtual void VisitPersistentHandle(Persistent<Value> value,
-                                     uint16_t class_id) {}
-#else
   virtual void VisitPersistentHandle(Persistent<Value>* value,
                                      uint16_t class_id) {}
-#endif
 };