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

third_party/WebKit/public/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/buildflag_header.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//third_party/WebKit/public/public_features.gni")
 import("//third_party/WebKit/Source/config.gni")
 import("//third_party/WebKit/Source/core/core.gni")
 import("//tools/grit/grit_rule.gni")
@@ skipping 595 matching lines @@
 }
 
 group("blink_generate_devtools_grd") {
   public_deps = [
     "//third_party/WebKit/Source/devtools:generate_devtools_grd",
   ]
 }
 
 grit("resources") {
   output_dir = "$root_gen_dir/blink/public/resources"
-  use_qualified_include = true
   source = "blink_resources.grd"
   outputs = [
     "grit/blink_resources.h",
     "blink_resources.pak",
   ]
   if (use_concatenated_impulse_responses) {
     grit_flags = [
       "-D",
       "use_concatenated_impulse_responses",
     ]
   }
   html_min_css = "$blink_core_output_dir/html.css"
   grit_flags += [
     "-E",
     "html_min_css=" + rebase_path(html_min_css),
   ]
   deps = [
     "//third_party/WebKit/Source/core:make_minimized_css",
   ]
 }
 
 grit("image_resources") {
   output_dir = "$root_gen_dir/blink/public/resources"
-  use_qualified_include = true
   source = "blink_image_resources.grd"
   outputs = [
     "grit/blink_image_resources.h",
     "blink_image_resources_100_percent.pak",
     "blink_image_resources_200_percent.pak",
   ]
 }
 
 mojom("mojo_bindings") {
   visibility = [ "//content/*" ]
@@ skipping 102 matching lines @@
 # relegated to a separate target to avoid duplication between the variants.
 source_set("shared_typemap_traits") {
   visibility = [ ":*" ]
   sources = [
     "web/ConsoleMessageStructTraits.cpp",
   ]
   deps = [
     ":mojo_bindings_shared__generator",
   ]
 }