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

ios/web/BUILD.gn

 # Copyright 2015 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("//ios/build/config.gni")
 import("//ios/web/js_compile.gni")
 import("//testing/test.gni")
 import("//tools/grit/grit_rule.gni")
 
 group("all_tests") {
@@ skipping 648 matching lines @@
 
   sources = [
     "web_state/js/resources/plugin_placeholder.js",
     "web_state/js/resources/post_request.js",
     "web_state/js/resources/window_id.js",
   ]
 }
 
 grit("resources") {
   source = "ios_web_resources.grd"
-  use_qualified_include = true
   outputs = [
     "grit/ios_web_resources.h",
     "ios_web_resources.pak",
   ]
   grit_flags = [
     "-E",
     "root_gen_dir=" + rebase_path(root_gen_dir, root_build_dir),
   ]
   deps = [
     "//mojo/public/js:bindings",
   ]
 }