DevTools: fix presubmit hooks for windows

third_party/WebKit/Source/devtools/scripts/install_node_deps.py

 #!/usr/bin/env python
 #
 # Copyright 2016 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.
 
 """
 Ensure node.js and npm modules are installed
 """
 
 import os
 from os import path
 import shutil
 import subprocess
 import sys
 
+import utils
+
 MIN_NODE_VERSION = 4
 LOCAL_NODE_VERSION = '4.5.0'
 
 scripts_path = path.dirname(path.abspath(__file__))
 install_local_node_path = path.join(scripts_path, 'local_node', 'node.py')
 local_node_runtimes_path = path.join(scripts_path, 'local_node', 'runtimes')
 local_node_binary_path = path.join(local_node_runtimes_path, LOCAL_NODE_VERSION, 'bin', 'node')
 local_npm_binary_path = path.join(local_node_runtimes_path, LOCAL_NODE_VERSION, 'bin', 'npm')
 
 
 def main():
     (node_path, npm_path) = resolve_node_paths()
     npm_install(npm_path)
 
 
 def resolve_node_paths():
     if has_valid_global_node():
-        return (which('node'), which('npm'))
+        if sys.platform == "win32":
+            return (utils.which('node'), utils.which('npm.cmd'))
+        return (utils.which('node'), utils.which('npm'))
     has_installed_local_node = path.isfile(local_node_binary_path)
     if has_installed_local_node:
         return (local_node_binary_path, local_npm_binary_path)
     if path.isdir(local_node_runtimes_path):
         shutil.rmtree(local_node_runtimes_path)
     if sys.platform == 'linux2' or sys.platform == 'darwin':
         install_node()
         return (local_node_binary_path, local_npm_binary_path)
     print('ERROR: Please install the latest node.js LTS version using the Windows installer:')
     print('https://nodejs.org/en/download/')
     raise
 
 
 def has_valid_global_node():
-    node_path = which('node')
+    node_path = utils.which('node')
     if not node_path:
         return False
     node_process = popen([node_path, '--version'])
     (node_process_out, _) = node_process.communicate()
     if node_process.returncode != 0:
         return False
     major_version = node_process_out[1]
     return int(major_version) >= MIN_NODE_VERSION
 
 
@@ skipping 12 matching lines @@
 
 def npm_install(npm_path):
     print('Runing npm install using {}'.format(npm_path))
     npm_process = popen([npm_path, 'install'])
     (npm_process_out, _) = npm_process.communicate()
     if npm_process.returncode != 0:
         print('WARNING: npm install had an issue')
     print(npm_process_out)
 
 
-# Based on http://stackoverflow.com/questions/377017/test-if-executable-exists-in-python.
-def which(program):
-    def is_exe(fpath):
-        return path.isfile(fpath) and os.access(fpath, os.X_OK)
-
-    fpath, fname = path.split(program)
-    if fpath:
-        if is_exe(program):
-            return program
-    else:
-        for part in os.environ['PATH'].split(os.pathsep):
-            part = part.strip('\"')
-            exe_file = path.join(part, program)
-            if is_exe(exe_file):
-                return exe_file
-    return None
-
-
 def popen(arguments, env=None):
     return subprocess.Popen(
         arguments, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, env=env)
 
 
 if __name__ == '__main__':
     sys.exit(main())