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

build/toolchain/toolchain.gni

 # Copyright 2015 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.
 
 # Toolchain-related configuration that may be needed outside the context of the
 # toolchain() rules themselves.
 
 import("//build/config/chrome_build.gni")
 
 declare_args() {
@@ skipping 74 matching lines @@
 
 # While other "tool"s in a toolchain are specific to the target of that
 # toolchain, the "stamp" and "copy" tools are really generic to the host;
 # but each toolchain must define them separately.  GN doesn't allow a
 # template instantiation inside a toolchain definition, so some boilerplate
 # has to be repeated in each toolchain to define these two tools.  These
 # four variables reduce the duplication in that boilerplate.
 stamp_description = "STAMP {{output}}"
 copy_description = "COPY {{source}} {{output}}"
 if (host_os == "win") {
-  stamp_command = "$python_path gyp-win-tool stamp {{output}}"
+  _tool_wrapper_path =
+      rebase_path("//build/toolchain/win/tool_wrapper.py", root_build_dir)
+
+  stamp_command = "$python_path $_tool_wrapper_path stamp {{output}}"
   copy_command =
-      "$python_path gyp-win-tool recursive-mirror {{source}} {{output}}"
+      "$python_path $_tool_wrapper_path recursive-mirror {{source}} {{output}}"
 } else {
   stamp_command = "touch {{output}}"
   copy_command = "ln -f {{source}} {{output}} 2>/dev/null || (rm -rf {{output}} && cp -af {{source}} {{output}})"
 }