DevTools: fix presubmit hooks for windows

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

Index: third_party/WebKit/Source/devtools/scripts/install_node_deps.py
diff --git a/third_party/WebKit/Source/devtools/scripts/install_node_deps.py b/third_party/WebKit/Source/devtools/scripts/install_node_deps.py
index ab8eeab8c9f89e1d0faf59c9c7fd6fa767d9d20c..6dd474eb599ff1fe4cb911d15c64e801e0f319be 100755
--- a/third_party/WebKit/Source/devtools/scripts/install_node_deps.py
+++ b/third_party/WebKit/Source/devtools/scripts/install_node_deps.py
@@ -14,6 +14,8 @@ import shutil
 import subprocess
 import sys
 
+import utils
+
 MIN_NODE_VERSION = 4
 LOCAL_NODE_VERSION = '4.5.0'
 
@@ -31,7 +33,9 @@ def main():
 
 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)
@@ -46,7 +50,7 @@ def resolve_node_paths():
 
 
 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'])
@@ -79,24 +83,6 @@ def npm_install(npm_path):
     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)