Move public symbols to the root set.

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index eeb1f3ce4583cb441d28181d02c66ce4b8db63b8..eb8cd7c5a5e7ca63c2bd25de4f2682ed651b7a20 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -1561,9 +1561,6 @@ void Genesis::InstallNativeFunctions() {
                  native_object_get_notifier);
   INSTALL_NATIVE(JSFunction, "NativeObjectNotifierPerformChange",
                  native_object_notifier_perform_change);
-
-  INSTALL_NATIVE(Symbol, "symbolIterator", iterator_symbol);
-  INSTALL_NATIVE(Symbol, "symbolUnscopables", unscopables_symbol);
   INSTALL_NATIVE(JSFunction, "ArrayValues", array_values_iterator);
 
 #define INSTALL_NATIVE_FUNCTIONS_FOR(id, descr) InstallNativeFunctions_##id();
@@ -1988,6 +1985,17 @@ bool Genesis::InstallNatives() {
     return true;
   }
 
+  // Install public symbols.
+  {
+    static const PropertyAttributes attributes =
+        static_cast<PropertyAttributes>(READ_ONLY | DONT_DELETE);
+#define INSTALL_PUBLIC_SYMBOL(name, varname, description)                 \
+  Handle<String> varname = factory()->NewStringFromStaticChars(#varname); \
+  JSObject::AddProperty(builtins, varname, factory()->name(), attributes);
+    PUBLIC_SYMBOL_LIST(INSTALL_PUBLIC_SYMBOL)
+#undef INSTALL_PUBLIC_SYMBOL
+  }
+
   // Install natives.
   for (int i = Natives::GetDebuggerCount();
        i < Natives::GetBuiltinsCount();
@@ -2114,22 +2122,22 @@ bool Genesis::InstallNatives() {
     Handle<AccessorInfo> arguments_iterator =
         Accessors::ArgumentsIteratorInfo(isolate(), attribs);
     {
-      CallbacksDescriptor d(Handle<Name>(native_context()->iterator_symbol()),
-                            arguments_iterator, attribs);
+      CallbacksDescriptor d(factory()->iterator_symbol(), arguments_iterator,
+                            attribs);
       Handle<Map> map(native_context()->sloppy_arguments_map());
       Map::EnsureDescriptorSlack(map, 1);
       map->AppendDescriptor(&d);
     }
     {
-      CallbacksDescriptor d(Handle<Name>(native_context()->iterator_symbol()),
-                            arguments_iterator, attribs);
+      CallbacksDescriptor d(factory()->iterator_symbol(), arguments_iterator,
+                            attribs);
       Handle<Map> map(native_context()->aliased_arguments_map());
       Map::EnsureDescriptorSlack(map, 1);
       map->AppendDescriptor(&d);
     }
     {
-      CallbacksDescriptor d(Handle<Name>(native_context()->iterator_symbol()),
-                            arguments_iterator, attribs);
+      CallbacksDescriptor d(factory()->iterator_symbol(), arguments_iterator,
+                            attribs);
       Handle<Map> map(native_context()->strict_arguments_map());
       Map::EnsureDescriptorSlack(map, 1);
       map->AppendDescriptor(&d);