Introduce {FAST,SLOW}_STRING_WRAPPER_ELEMENTS

src/key-accumulator.h

Index: src/key-accumulator.h
diff --git a/src/key-accumulator.h b/src/key-accumulator.h
index 8a4d886f515db441e1a8346daf4f0442e1a1dc03..2c90bba1651b87ef9da64a91aaf06395f802e71c 100644
--- a/src/key-accumulator.h
+++ b/src/key-accumulator.h
@@ -36,12 +36,10 @@ class KeyAccumulator final BASE_EMBEDDED {
   ~KeyAccumulator();
 
   bool AddKey(uint32_t key);
-  bool AddKey(Object* key, AddKeyConversion convert = DO_NOT_CONVERT);
-  bool AddKey(Handle<Object> key, AddKeyConversion convert = DO_NOT_CONVERT);
-  void AddKeys(Handle<FixedArray> array,
-               AddKeyConversion convert = DO_NOT_CONVERT);
-  void AddKeys(Handle<JSObject> array,
-               AddKeyConversion convert = DO_NOT_CONVERT);
+  bool AddKey(Object* key, AddKeyConversion convert);
+  bool AddKey(Handle<Object> key, AddKeyConversion convert);
+  void AddKeys(Handle<FixedArray> array, AddKeyConversion convert);
+  void AddKeys(Handle<JSObject> array, AddKeyConversion convert);
   void AddKeysFromProxy(Handle<JSObject> array);
   Maybe<bool> AddKeysFromProxy(Handle<JSProxy> proxy, Handle<FixedArray> keys);
   void AddElementKeysFromInterceptor(Handle<JSObject> array);