Make blink_trybot recipe work on windows

scripts/slave/recipes/polymer.py

 # Copyright (c) 2013 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.
 
-DEPS = ['path', 'git', 'properties', 'step', 'platform']
+DEPS = [
+  'git',
+  'path',
+  'platform',
+  'properties',
+  'step',
+]
 
 def GenSteps(api):
   yield api.git.checkout(api.properties['repository'] + '.git', recursive=True)
 
   tmp_path = api.path.checkout('.tmp')
   yield api.step('mktmp', ['mkdir', tmp_path])
   yield api.step('update-install', ['npm', 'install', '--tmp', tmp_path],
              cwd=api.path.checkout())
 
   test_prefix = ['xvfb-run'] if api.platform.is_linux else []
   yield api.step('test', test_prefix+['grunt', 'test-buildbot'],
              cwd=api.path.checkout(), allow_subannotations=True)
 
 
 def GenTests(api):
   yield 'basic', {
     'properties': api.properties_scheduled(
         repository='https://github.com/Polymer/polymer'),
   }