Fix the no-i18n build

BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/android/config.gni")
 import("//build/config/arm.gni")
 import("//build/config/mips.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 
 if (is_android) {
@@ skipping 403 matching lines @@
   sources = [
     "src/js/macros.py",
     "src/messages.h",
     "src/js/harmony-atomics.js",
     "src/js/harmony-regexp-exec.js",
     "src/js/harmony-sharedarraybuffer.js",
     "src/js/harmony-simd.js",
     "src/js/harmony-species.js",
     "src/js/harmony-unicode-regexps.js",
     "src/js/harmony-string-padding.js",
-    "src/js/intl-extra.js",
     "src/js/promise-extra.js",
   ]
 
   outputs = [
     "$target_gen_dir/experimental-libraries.cc",
   ]
 
   if (v8_enable_i18n_support) {
-    sources += [ "src/js/icu-case-mapping.js" ]
+    sources += [
+      "src/js/icu-case-mapping.js",
+      "src/js/intl-extra.js",
+    ]
   }
 
   args = [
            rebase_path("$target_gen_dir/experimental-libraries.cc",
                        root_build_dir),
            "EXPERIMENTAL",
          ] + rebase_path(sources, root_build_dir)
 
   if (v8_use_external_startup_data) {
     outputs += [ "$target_gen_dir/libraries_experimental.bin" ]
@@ skipping 1757 matching lines @@
   ]
 
   deps = [
     ":fuzzer_support",
   ]
 
   configs = [
     ":internal_config",
   ]
 }