[es6] Remove harmony-classes flag

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index f3533c993f5a0eeadaa60c9ec5e2df0bb5e83670..867a0da57225e5b28fd51cee14ffcfcb66df48a2 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -1800,7 +1800,6 @@ void Genesis::InitializeBuiltinTypedArrays() {
 EMPTY_NATIVE_FUNCTIONS_FOR_FEATURE(harmony_modules)
 EMPTY_NATIVE_FUNCTIONS_FOR_FEATURE(harmony_arrays)
 EMPTY_NATIVE_FUNCTIONS_FOR_FEATURE(harmony_array_includes)
-EMPTY_NATIVE_FUNCTIONS_FOR_FEATURE(harmony_classes)
 EMPTY_NATIVE_FUNCTIONS_FOR_FEATURE(harmony_regexps)
 EMPTY_NATIVE_FUNCTIONS_FOR_FEATURE(harmony_arrow_functions)
 EMPTY_NATIVE_FUNCTIONS_FOR_FEATURE(harmony_tostring)
@@ -1837,7 +1836,6 @@ void Genesis::InstallNativeFunctions_harmony_proxies() {
 EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_modules)
 EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_arrays)
 EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_array_includes)
-EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_classes)
 EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_arrow_functions)
 EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_proxies)
 EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_sloppy)
@@ -2471,7 +2469,6 @@ bool Genesis::InstallExperimentalNatives() {
   static const char* harmony_array_includes_natives[] = {
       "native harmony-array-includes.js", nullptr};
   static const char* harmony_proxies_natives[] = {"native proxy.js", nullptr};
-  static const char* harmony_classes_natives[] = {nullptr};
   static const char* harmony_modules_natives[] = {nullptr};
   static const char* harmony_regexps_natives[] = {"native harmony-regexp.js",
                                                   nullptr};