Cleanup unnecessary duplication of runtime functions.

src/runtime/runtime-numbers.cc

Index: src/runtime/runtime-numbers.cc
diff --git a/src/runtime/runtime-numbers.cc b/src/runtime/runtime-numbers.cc
index 3be4cc0f9fe1ffd0a615fde234fcd0b187460ffa..d9a0c9ffa6f724cbc6ee1a5f2bdaa55282801c8b 100644
--- a/src/runtime/runtime-numbers.cc
+++ b/src/runtime/runtime-numbers.cc
@@ -231,7 +231,7 @@ RUNTIME_FUNCTION(Runtime_StringParseFloat) {
 }
 
 
-RUNTIME_FUNCTION(Runtime_NumberToStringRT) {
+RUNTIME_FUNCTION(Runtime_NumberToString) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_NUMBER_ARG_HANDLE_CHECKED(number, 0);
@@ -558,12 +558,6 @@ RUNTIME_FUNCTION(Runtime_MaxSmi) {
 }
 
 
-RUNTIME_FUNCTION(Runtime_NumberToString) {
-  SealHandleScope shs(isolate);
-  return __RT_impl_Runtime_NumberToStringRT(args, isolate);
-}
-
-
 RUNTIME_FUNCTION(Runtime_IsSmi) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 1);