Remove --intl-extra flag

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/dcheck_always_on.gni")
 import("//build/config/mips.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 
@@ skipping 447 matching lines @@
   ]
 
   outputs = [
     "$target_gen_dir/experimental-libraries.cc",
   ]
 
   if (v8_enable_i18n_support) {
     sources += [
       "src/js/datetime-format-to-parts.js",
       "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) {
@@ skipping 2292 matching lines @@
     ":fuzzer_support",
     ":lib_wasm_section_fuzzer",
     ":wasm_module_runner",
   ]
 
   configs = [ ":internal_config" ]
 }
 
 v8_fuzzer("wasm_data_section_fuzzer") {
 }