More fixes for the Windows GN build.

courgette/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")
 
 static_library("courgette_lib") {
   sources = [
     "adjustment_method.cc",
     "adjustment_method.h",
@@ skipping 111 matching lines @@
           "$root_out_dir/courgette.exe",
         ]
         deps = [
           ":courgette",
         ]
       }
     } else {
       # Make sure that we have a copy of courgette64.exe in the root out
       # directory.
       copy("copy_courgette_binaries") {
+        courgette64_label = ":courgette(//build/toolchain/win:x64)"
+        courgette64_out_dir = get_label_info(courgette64_label, "root_out_dir")
         sources = [
-          "$root_out_dir/x64/courgette64.exe",
+          "$courgette64_out_dir/courgette64.exe",
         ]
         outputs = [
-          "$root_out_dir/courgette64.exe",
+          "$root_out_dir/{{source_file_part}}",
         ]
         deps = [
-          ":courgette(//build/toolchain/win:x64)",
+          courgette64_label,
         ]
       }
     }
   }
 }
 
 test("courgette_unittests") {
   sources = [
     "adjustment_method_unittest.cc",
     "base_test_unittest.cc",
@@ skipping 44 matching lines @@
     "encoded_program_fuzz_unittest.cc",
   ]
   deps = [
     ":courgette_lib",
     "//base",
     "//base:i18n",
     "//base/test:test_support",
     "//testing/gtest",
   ]
 }