Reland v8::Private and related APIs

src/factory.cc

Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index f475efcc7725c72a9179a1b580baae0e44116ecb..abd805e57218c1f5fa5053f17f54270f92472d9c 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -708,14 +708,9 @@ Handle<Symbol> Factory::NewSymbol() {
 }
 
 
-Handle<Symbol> Factory::NewPrivateSymbol(Handle<Object> name) {
+Handle<Symbol> Factory::NewPrivateSymbol() {
   Handle<Symbol> symbol = NewSymbol();
   symbol->set_is_private(true);
-  if (name->IsString()) {
-    symbol->set_name(*name);
-  } else {
-    DCHECK(name->IsUndefined());
-  }
   return symbol;
 }