Version 4.4.63.24 (cherry-pick)

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 4823243f2384b510771dd53a76dfa3bdb80c9471..5ec1d7d27baf319932d3153584b80c54d384f012 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -3553,6 +3553,7 @@ class StringTable: public HashTable<StringTable,
   // added. The return value is the string found.
   static Handle<String> LookupString(Isolate* isolate, Handle<String> key);
   static Handle<String> LookupKey(Isolate* isolate, HashTableKey* key);
+  static String* LookupKeyIfExists(Isolate* isolate, HashTableKey* key);
 
   // Tries to internalize given string and returns string handle on success
   // or an empty handle otherwise.