GN: Specify grit generated output paths to be the same as gyp's.

chrome/renderer/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/features.gni")
 import("//tools/grit/grit_rule.gni")
 
 gypi_values = exec_script(
     "//build/gypi_to_gn.py",
     [ rebase_path("../chrome_renderer.gypi") ],
     "scope",
     [ "../chrome_renderer.gypi" ])
 
 # GYP version: chrome/chrome_resources.gyp:chrome_resources
 # (generate_renderer_resources action)
 grit("resources") {
   source = "resources/renderer_resources.grd"
+  output_dir = "$root_gen_dir/chrome"
   outputs = [
     "grit/renderer_resources.h",
     "renderer_resources_100_percent.pak",
     "renderer_resources_200_percent.pak",
   ]
 }
 
 static_library("renderer") {
   sources = rebase_path(gypi_values.chrome_renderer_sources, ".", "..")
 
@@ skipping 122 matching lines @@
   #     ['win_pdf_metafile_for_printing==1', {
   #       'sources': [
   #         'renderer/printing/print_web_view_helper_pdf_win.cc',
   #       ],
   #     }, {
   #       'sources': [
   #         'renderer/printing/print_web_view_helper_win.cc',
   #       ],
   #     }],
 }