[snapshot] full setup delegate should also be able to deserialize.

src/snapshot/snapshot.h

Index: src/snapshot/snapshot.h
diff --git a/src/snapshot/snapshot.h b/src/snapshot/snapshot.h
index 30dbd236ddac200ef688ed67686dcd06212dff30..7d9082e6d21080cd13b7686720159aa20b2b3369 100644
--- a/src/snapshot/snapshot.h
+++ b/src/snapshot/snapshot.h
@@ -62,8 +62,6 @@ class Snapshot : public AllStatic {
       size_t context_index,
       v8::DeserializeEmbedderFieldsCallback embedder_fields_deserializer);
 
-  static bool HaveASnapshotToStartFrom(Isolate* isolate);
-
   static bool HasContextSnapshot(Isolate* isolate, size_t index);
 
   static bool EmbedsScript(Isolate* isolate);