Move runtime helper for ToName conversion onto Object.

src/runtime/runtime.h

Index: src/runtime/runtime.h
diff --git a/src/runtime/runtime.h b/src/runtime/runtime.h
index dcc010807e5c7801b9930f3dacdebf8f2a27d8b2..fc09f97fe5e8b13ce9de214417eb03b0f0606171 100644
--- a/src/runtime/runtime.h
+++ b/src/runtime/runtime.h
@@ -1150,9 +1150,6 @@ class Runtime : public AllStatic {
   MUST_USE_RESULT static MaybeHandle<Object> GetPrototype(
       Isolate* isolate, Handle<Object> object);
 
-  MUST_USE_RESULT static MaybeHandle<Name> ToName(Isolate* isolate,
-                                                  Handle<Object> key);
-
   enum TypedArrayId {
     // arrayIds below should be synchronized with typedarray.js natives.
     ARRAY_ID_UINT8 = 1,