Remove infrastructure for experimental JS natives

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"
 
 namespace v8 {
 namespace internal {
 
 template <>
 FixedArray* NativesCollection<CORE>::GetSourceCache(Heap* heap) {
   return heap->natives_source_cache();
 }
 
 
 template <>
-FixedArray* NativesCollection<EXPERIMENTAL>::GetSourceCache(Heap* heap) {
-  return heap->experimental_natives_source_cache();
-}
-
-
-template <>
 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();
 }
 
 }  // namespace internal
 }  // namespace v8