Simplify language feature management.

src/runtime/runtime-test.cc

Index: src/runtime/runtime-test.cc
diff --git a/src/runtime/runtime-test.cc b/src/runtime/runtime-test.cc
index cf0a23944334bf6d21ae938568ce41b54d9a777d..6b3fd130bbc679b69071426b4ddd6bb8d5ac208f 100644
--- a/src/runtime/runtime-test.cc
+++ b/src/runtime/runtime-test.cc
@@ -7,6 +7,7 @@
 #include "src/arguments.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen.h"
+#include "src/natives.h"
 #include "src/runtime/runtime-utils.h"
 
 namespace v8 {
@@ -293,6 +294,12 @@ RUNTIME_FUNCTION(Runtime_AbortJS) {
 }
 
 
+RUNTIME_FUNCTION(Runtime_NativeScriptsCount) {
+  DCHECK(args.length() == 0);
+  return Smi::FromInt(Natives::GetBuiltinsCount());
+}
+
+
 // Returns V8 version as a string.
 RUNTIME_FUNCTION(Runtime_GetV8Version) {
   HandleScope scope(isolate);