Update harmony ObjectProtoToString() to 2/2/2015 spec

test/cctest/cctest.h

Index: test/cctest/cctest.h
diff --git a/test/cctest/cctest.h b/test/cctest/cctest.h
index 2f33d13394734a3075eefaab9db72a20f653aba0..1d70c0e8aea4dcb773381c30eb89a012099d4fd0 100644
--- a/test/cctest/cctest.h
+++ b/test/cctest/cctest.h
@@ -347,6 +347,11 @@ static inline v8::Local<v8::String> v8_str(const char* x) {
 }
 
 
+static inline v8::Local<v8::Symbol> v8_symbol(const char* name) {
+  return v8::Symbol::New(v8::Isolate::GetCurrent(), v8_str(name));
+}
+
+
 static inline v8::Local<v8::Script> v8_compile(const char* x) {
   return v8::Script::Compile(v8_str(x));
 }