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

chrome/app/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/ui.gni")
 import("//chrome/common/features.gni")
 import("//ppapi/features/features.gni")
 import("//printing/features/features.gni")
 import("//services/catalog/public/tools/catalog.gni")
 import("//services/service_manager/public/service_manifest.gni")
@@ skipping 85 matching lines @@
     "java/res/values-uk/generated_resources.xml",
     "java/res/values-vi/generated_resources.xml",
     "java/res/values-zh-rCN/generated_resources.xml",
     "java/res/values-zh-rTW/generated_resources.xml",
     "java/res/values/generated_resources.xml",
   ]
 }
 
 grit("generated_resources") {
   source = "generated_resources.grd"
-  use_qualified_include = true
   defines = chrome_grit_defines
   output_dir = "$root_gen_dir/chrome"
   outputs = [
     "grit/generated_resources.h",
     "generated_resources_am.pak",
     "generated_resources_ar.pak",
     "generated_resources_bg.pak",
     "generated_resources_bn.pak",
     "generated_resources_ca.pak",
     "generated_resources_cs.pak",
@@ skipping 58 matching lines @@
     generated_files =
         rebase_path(android_generated_java_resources, "java/res", ".")
     deps = [
       ":generated_resources",
     ]
   }
 }
 
 grit("google_chrome_strings") {
   source = "google_chrome_strings.grd"
-  use_qualified_include = true
   defines = chrome_grit_defines
   output_dir = "$root_gen_dir/chrome"
   outputs = [
     "grit/google_chrome_strings.h",
     "google_chrome_strings_am.pak",
     "google_chrome_strings_ar.pak",
     "google_chrome_strings_bg.pak",
     "google_chrome_strings_bn.pak",
     "google_chrome_strings_ca.pak",
     "google_chrome_strings_cs.pak",
@@ skipping 43 matching lines @@
     "google_chrome_strings_uk.pak",
     "google_chrome_strings_vi.pak",
     "google_chrome_strings_zh-CN.pak",
     "google_chrome_strings_zh-TW.pak",
     "google_chrome_strings_fake-bidi.pak",
   ]
 }
 
 grit("chromium_strings") {
   source = "chromium_strings.grd"
-  use_qualified_include = true
   defines = chrome_grit_defines
   output_dir = "$root_gen_dir/chrome"
   outputs = [
     "grit/chromium_strings.h",
     "chromium_strings_am.pak",
     "chromium_strings_ar.pak",
     "chromium_strings_bg.pak",
     "chromium_strings_bn.pak",
     "chromium_strings_ca.pak",
     "chromium_strings_cs.pak",
@@ skipping 236 matching lines @@
           chrome_embedded_services +
           [ ":chrome_content_packaged_services_manifest_for_mash" ]
     }
   }
 
   catalog("catalog") {
     embedded_services = chrome_embedded_services +
                         [ ":chrome_content_packaged_services_manifest" ]
   }
 }