introduce eternal handles

src/heap.h

Index: src/heap.h
diff --git a/src/heap.h b/src/heap.h
index 672b8c1632570599cd0b791a47173394c365b010..1b6bf8eb019d3466bc70d55fe49aa5a06832fe01 100644
--- a/src/heap.h
+++ b/src/heap.h
@@ -189,9 +189,7 @@ namespace internal {
   V(Symbol, elements_transition_symbol, ElementsTransitionSymbol)              \
   V(SeededNumberDictionary, empty_slow_element_dictionary,                     \
       EmptySlowElementDictionary)                                              \
-  V(Symbol, observed_symbol, ObservedSymbol)                                   \
-  V(HeapObject, i18n_template_one, I18nTemplateOne)                            \
-  V(HeapObject, i18n_template_two, I18nTemplateTwo)
+  V(Symbol, observed_symbol, ObservedSymbol)
 
 #define ROOT_LIST(V)                                  \
   STRONG_ROOT_LIST(V)                                 \
@@ -1302,12 +1300,6 @@ class Heap {
     ASSERT((callback == NULL) ^ (global_gc_epilogue_callback_ == NULL));
     global_gc_epilogue_callback_ = callback;
   }
-  void SetI18nTemplateOne(ObjectTemplateInfo* tmpl) {
-    set_i18n_template_one(tmpl);
-  }
-  void SetI18nTemplateTwo(ObjectTemplateInfo* tmpl) {
-    set_i18n_template_two(tmpl);
-  }
 
   // Heap root getters.  We have versions with and without type::cast() here.
   // You can't use type::cast during GC because the assert fails.