Move gyp-win-tool to the GN Windows toolchain.

build/toolchain/win/midl.gni

 # 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.
 
 assert(is_win)
 
 import("//build/config/win/visual_studio_version.gni")
 
 # This template defines a rule to invoke the MS IDL compiler. The generated
 # source code will be compiled and linked into targets that depend on this.
@@ skipping 26 matching lines @@
   interface_identifier_file = "{{source_name_part}}_i.c"
   proxy_file = "{{source_name_part}}_p.c"
   type_library_file = "{{source_name_part}}.tlb"
 
   action_foreach(action_name) {
     visibility = [ ":$source_set_name" ]
 
     # This functionality is handled by the win-tool because the GYP build has
     # MIDL support built-in.
     # TODO(brettw) move this to a separate MIDL wrapper script for better
-    # clarity once GYP support is not needed.
-    script = "$root_build_dir/gyp-win-tool"
+    # clarity.
+    script = "//build/toolchain/win/tool_wrapper.py"
 
     sources = invoker.sources
 
     # Note that .tlb is not included in the outputs as it is not always
     # generated depending on the content of the input idl file.
     outputs = [
       "$out_dir/$header_file",
       "$out_dir/$dlldata_file",
       "$out_dir/$interface_identifier_file",
       "$out_dir/$proxy_file",
@@ skipping 36 matching lines @@
     sources = process_file_template(invoker.sources,
                                     [ "$out_dir/$interface_identifier_file" ])
 
     public_deps = [
       ":$action_name",
     ]
 
     configs += [ "//build/config/win:midl_warnings" ]
   }
 }