gn: Make grit() default to requiring qualified #includes.

third_party/libaddressinput/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("//testing/test.gni")
 import("//build/config/locales.gni")
 import("//tools/grit/grit_rule.gni")
 
 config("no-newline-eof-warning") {
   if (is_clang) {
     cflags = [ "-Wno-newline-eof" ]
   }
 }
 
 grit("strings") {
   source = "//chrome/app/address_input_strings.grd"
+
+  # libaddressinput's tests just say `#include "messages.h"`.
+  use_qualified_include = false
+
   outputs = [
     "messages.h",
     "en_messages.cc",
   ]
   foreach(locale, locales_with_fake_bidi) {
     outputs += [ "address_input_strings_$locale.pak" ]
   }
 
   configs = [ ":no-newline-eof-warning" ]
 }
@@ skipping 180 matching lines @@
   deps = [
     ":libaddressinput",
     ":strings",
     ":test_support",
     "//base/test:run_all_unittests",
     "//components/prefs",
     "//net:test_support",
     "//testing/gtest",
   ]
 }