[serializer] do not cache resource data pointer for native source.

src/snapshot/natives-common.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // The common functionality when building with internal or external natives.
 
 #include "src/heap/heap.h"
 #include "src/objects-inl.h"
 #include "src/snapshot/natives.h"
 
@@ skipping 16 matching lines @@
 FixedArray* NativesCollection<EXTRAS>::GetSourceCache(Heap* heap) {
   return heap->extra_natives_source_cache();
 }
 
 
 template <>
 FixedArray* NativesCollection<EXPERIMENTAL_EXTRAS>::GetSourceCache(Heap* heap) {
   return heap->experimental_extra_natives_source_cache();
 }
 
-
-template <NativeType type>
-void NativesCollection<type>::UpdateSourceCache(Heap* heap) {
-  for (int i = 0; i < GetBuiltinsCount(); i++) {
-    Object* source = GetSourceCache(heap)->get(i);
-    if (!source->IsUndefined()) {
-      ExternalOneByteString::cast(source)->update_data_cache();
-    }
-  }
-}
-
-
-// Explicit template instantiations.
-template void NativesCollection<CORE>::UpdateSourceCache(Heap* heap);
-template void NativesCollection<EXPERIMENTAL>::UpdateSourceCache(Heap* heap);
-template void NativesCollection<EXTRAS>::UpdateSourceCache(Heap* heap);
-template void NativesCollection<EXPERIMENTAL_EXTRAS>::UpdateSourceCache(
-    Heap* heap);
-
 }  // namespace internal
 }  // namespace v8