[snapshot] encode resource before serializing.

src/snapshot/deserializer.h

Index: src/snapshot/deserializer.h
diff --git a/src/snapshot/deserializer.h b/src/snapshot/deserializer.h
index 76259a80cda5e2c0c2a7769a154630e991e31876..66025fe08c759c1a2f559904323dcb75e6c4241e 100644
--- a/src/snapshot/deserializer.h
+++ b/src/snapshot/deserializer.h
@@ -117,9 +117,6 @@ class Deserializer : public SerializerDeserializer {
   // snapshot by chunk index and offset.
   HeapObject* GetBackReferencedObject(int space);
 
-  Object** CopyInNativesSource(Vector<const char> source_vector,
-                               Object** current);
-
   // Cached current isolate.
   Isolate* isolate_;