Stop setting use_qualified_include to true now that that is the default.

ui/strings/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/locales.gni")
 import("//tools/grit/grit_rule.gni")
 
 # Meta target that includes both ui_strings and app_locale_settings. Most
 # targets want both. You can depend on the individually if you need to.
 group("strings") {
   public_deps = [
     ":app_locale_settings",
     ":ui_strings",
   ]
 }
 
 grit("ui_strings") {
   source = "ui_strings.grd"
-  use_qualified_include = true
   outputs = [
     "grit/ui_strings.h",
   ]
   foreach(locale, locales_with_fake_bidi) {
     outputs += [ "ui_strings_$locale.pak" ]
   }
 }
 
 grit("app_locale_settings") {
   source = "app_locale_settings.grd"
-  use_qualified_include = true
   outputs = [
     "grit/app_locale_settings.h",
   ]
   foreach(locale, locales_with_fake_bidi) {
     outputs += [ "app_locale_settings_$locale.pak" ]
   }
 }