Extract functions from path recipe module so that step can depend on it

scripts/slave/recipes/skia/infra.py

 # 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.
 
 
 # Recipe for Skia Infra.
 
 
 DEPS = [
+  'file',
   'path',
   'platform',
   'properties',
   'python',
   'raw_io',
   'rietveld',
   'step',
 ]
 
 
@@ skipping 32 matching lines @@
   test_data = lambda: api.raw_io.test_api.stream_output('abc123')
   rev_parse = git(api, 'rev-parse', 'HEAD',
                   cwd=dest, stdout=api.raw_io.output(),
                   step_test_data=test_data)
   rev_parse.presentation.properties['got_revision'] = rev_parse.stdout.strip()
 
 
 def GenSteps(api):
   go_dir = api.path['slave_build'].join('go')
   go_src = go_dir.join('src')
-  api.path.makedirs('makedirs go/src', go_src)
+  api.file.makedirs('makedirs go/src', go_src)
   infra_dir = go_src.join(INFRA_GO)
 
   # Check out the infra repo.
   git_checkout(
       api,
       INFRA_GIT_URL,
       dest=infra_dir,
       ref=api.properties.get('revision', 'origin/master'))
   api.path['checkout'] = infra_dir
 
@@ skipping 39 matching lines @@
   yield (
       api.test('Infra-PerCommit_initialcheckout')
   )
   yield (
       api.test('Infra-PerCommit_try') +
       api.properties(rietveld='https://codereview.chromium.org',
                      issue=1234,
                      patchset=1,
                      revision=REF_HEAD)
   )