Remove infrastructure for experimental JS natives

src/snapshot/natives-common.cc

Index: src/snapshot/natives-common.cc
diff --git a/src/snapshot/natives-common.cc b/src/snapshot/natives-common.cc
index 338b92bd16827255b3d10b9b83c2aa6efaf00c61..446c50f8a6fcae17d8e46a1df01e28c527e2674a 100644
--- a/src/snapshot/natives-common.cc
+++ b/src/snapshot/natives-common.cc
@@ -18,12 +18,6 @@ FixedArray* NativesCollection<CORE>::GetSourceCache(Heap* heap) {
 
 
 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();
 }