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

scripts/slave/recipes/chromium_codesearch.py

 # Copyright 2014 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.
 
 from infra.libs.infra_types import freeze
 
 DEPS = [
   'bot_update',
   'chromium',
   'commit_position',
+  'file',
   'gclient',
   'gsutil',
   'json',
   'path',
   'properties',
   'python',
   'raw_io',
   'step',
 ]
 
@@ skipping 162 matching lines @@
       platform, commit_position)
   api.python('create index pack',
              api.path['build'].join('scripts', 'slave', 'chromium',
                                     'package_index.py'),
              ['--path-to-compdb', debug_path.join('compile_commands.json'),
               '--path-to-archive-output', debug_path.join(index_pack_name)])
 
   # Remove the llvm-build directory, so that gclient runhooks will download
   # the pre-built clang binary and not use the locally compiled binary from
   # the 'compile translation_unit clang tool' step.
-  api.path.rmtree('llvm-build',
+  api.file.rmtree('llvm-build',
                   api.path['checkout'].join('third_party', 'llvm-build'))
 
   # Upload the index pack
   environment = bot_config.get('environment', 'prod')
   api.gsutil.upload(
       name='upload index pack',
       source=debug_path.join(index_pack_name),
       bucket=BUCKET_NAME,
       dest='%s/%s' % (environment, index_pack_name_with_revision)
   )
@@ skipping 38 matching lines @@
     api.test(
         'full_%s_fail' % _sanitize_nonalpha('ChromiumOS Codesearch Staging')) +
     api.step_data('generate compilation database for chromeos',
                   stdout=api.raw_io.output('some compilation data')) +
     api.step_data('generate compilation database for linux',
                   stdout=api.raw_io.output('some compilation data')) +
     api.step_data('run translation_unit clang tool', retcode=2) +
     api.properties.generic(buildername='ChromiumOS Codesearch Staging',
                            mastername='chromium.fyi')
   )