[es6] remove --harmony-templates flag

src/preparser.h

Index: src/preparser.h
diff --git a/src/preparser.h b/src/preparser.h
index d53447c92196c232f39bbc293412d61479fa8c4d..08963c942540f05f97a1893a5166b243522a56d7 100644
--- a/src/preparser.h
+++ b/src/preparser.h
@@ -107,7 +107,6 @@ class ParserBase : public Traits {
   bool allow_harmony_object_literals() const {
     return allow_harmony_object_literals_;
   }
-  bool allow_harmony_templates() const { return scanner()->HarmonyTemplates(); }
   bool allow_harmony_sloppy() const { return allow_harmony_sloppy_; }
   bool allow_harmony_unicode() const { return scanner()->HarmonyUnicode(); }
   bool allow_harmony_computed_property_names() const {
@@ -138,9 +137,6 @@ class ParserBase : public Traits {
   void set_allow_harmony_object_literals(bool allow) {
     allow_harmony_object_literals_ = allow;
   }
-  void set_allow_harmony_templates(bool allow) {
-    scanner()->SetHarmonyTemplates(allow);
-  }
   void set_allow_harmony_sloppy(bool allow) {
     allow_harmony_sloppy_ = allow;
   }