Move v8_use_external_startup_data out of //build/config:feature_flags.

components/html_viewer/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_overrides/v8.gni")
 import("//mojo/public/mojo_application.gni")
 import("//testing/test.gni")
 import("//tools/grit/grit_rule.gni")
 import("//tools/grit/repack.gni")
 
@@ skipping 203 matching lines @@
   if (is_linux && !is_android) {
     deps += [ "//components/font_service/public/cpp" ]
   }
 
   data_deps = [
     "//components/clipboard",
     "//components/mus/ws:lib",
     "//mojo/services/network:network",
     "//mojo/services/tracing",
   ]
+
+  configs += [ "//v8:external_startup_data" ]
 }
 
 mojo_native_application("html_viewer") {
   sources = [
     "html_viewer_main.cc",
   ]
   deps = [
     ":lib",
     ":pak",
     "//base",
@@ skipping 92 matching lines @@
     "//ui/base",
     "//ui/events",
     "//ui/events:test_support",
     "//ui/mojo/init",
   ]
 
   if (is_android) {
     deps += [ ":build_unittest_assets" ]
     apk_asset_location = html_viewer_unittests_assets
   }
+
+  configs += [ "//v8:external_startup_data" ]
 }
 
 mojo_native_application("apptests") {
   output_name = "html_viewer_apptests"
   testonly = true
 
   sources = [
     "ax_provider_apptest.cc",
     "html_frame_apptest.cc",
   ]
@@ skipping 16 matching lines @@
   ]
 
   data_deps = [
     ":html_viewer",
   ]
 
   if (is_linux && !is_android) {
     data_deps += [ "//components/font_service" ]
   }
 }