v8::Private::ForApi should be context-independent.

src/runtime/runtime-symbol.cc

Index: src/runtime/runtime-symbol.cc
diff --git a/src/runtime/runtime-symbol.cc b/src/runtime/runtime-symbol.cc
index 300a6439b1279c1d6cacec712ac22583935e5600..b7d81613dabc5ae172d301fe138d908e05ba5da3 100644
--- a/src/runtime/runtime-symbol.cc
+++ b/src/runtime/runtime-symbol.cc
@@ -56,13 +56,6 @@ RUNTIME_FUNCTION(Runtime_SymbolDescriptiveString) {
 }
 
 
-RUNTIME_FUNCTION(Runtime_SymbolRegistry) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 0);
-  return *isolate->GetSymbolRegistry();
-}
-
-
 RUNTIME_FUNCTION(Runtime_SymbolIsPrivate) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 1);