Move functions from handles.cc to where they belong.

src/builtins.cc

Index: src/builtins.cc
diff --git a/src/builtins.cc b/src/builtins.cc
index c87132ead3264cf41a26fc1a712a5c1aff8ac878..bfbc565ec346de55f272c0f6087066f1465b5522 100644
--- a/src/builtins.cc
+++ b/src/builtins.cc
@@ -372,9 +372,10 @@ MUST_USE_RESULT static MaybeObject* CallJsBuiltin(
     BuiltinArguments<NO_EXTRA_ARGUMENTS> args) {
   HandleScope handleScope(isolate);
 
-  Handle<Object> js_builtin =
-      GetProperty(Handle<JSObject>(isolate->native_context()->builtins()),
-                  name).ToHandleChecked();
+  Handle<Object> js_builtin = Object::GetProperty(
+      isolate,
+      handle(isolate->native_context()->builtins(), isolate),
+      name).ToHandleChecked();
   Handle<JSFunction> function = Handle<JSFunction>::cast(js_builtin);
   int argc = args.length() - 1;
   ScopedVector<Handle<Object> > argv(argc);