Small polishing changes to the native js.

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 79487237ee65bdd3f820e7f5d9575f320316bd17..78dd3cbef6754f8c1996d406d6367d8a18b4fa03 100644
--- a/src/runtime/runtime-numbers.cc
+++ b/src/runtime/runtime-numbers.cc
@@ -551,14 +551,6 @@ RUNTIME_FUNCTION(Runtime_SmiLexicographicCompare) {
 }
 
 
-RUNTIME_FUNCTION(Runtime_GetRootNaN) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 0);
-  RUNTIME_ASSERT(isolate->bootstrapper()->IsActive());
-  return isolate->heap()->nan_value();
-}
-
-
 RUNTIME_FUNCTION(Runtime_MaxSmi) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 0);