Fix JSFunction's in-object properties initialization.

src/factory.h

Index: src/factory.h
diff --git a/src/factory.h b/src/factory.h
index 0403e8f9226854bb949a92c42c50aa12af0e3773..da4417a88b61a2ffaf95901861b4937e45ed1fbe 100644
--- a/src/factory.h
+++ b/src/factory.h
@@ -695,14 +695,6 @@ class Factory final {
   // Update the cache with a new number-string pair.
   void SetNumberStringCache(Handle<Object> number, Handle<String> string);
 
-  // Initializes a function with a shared part and prototype.
-  // Note: this code was factored out of NewFunction such that other parts of
-  // the VM could use it. Specifically, a function that creates instances of
-  // type JS_FUNCTION_TYPE benefit from the use of this function.
-  inline void InitializeFunction(Handle<JSFunction> function,
-                                 Handle<SharedFunctionInfo> info,
-                                 Handle<Context> context);
-
   // Creates a function initialized with a shared part.
   Handle<JSFunction> NewFunction(Handle<Map> map,
                                  Handle<SharedFunctionInfo> info,