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

scripts/slave/recipe_modules/archive/api.py

 # Copyright 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.
 
 import re
 
 from slave import recipe_api
 
 
 # Regular expression to identify a Git hash.
@@ skipping 191 matching lines @@
     """
     target = self.m.path.split(build_dir)[-1]
     commit_position = self._get_commit_position(
         update_properties, primary_project)
     cp_branch, cp_number = self.m.commit_position.parse(commit_position)
     build_git_commit = self._get_git_commit(update_properties, primary_project)
 
     staging_dir = self.m.path['slave_build'].join('chrome_staging')
 
     # Build the list of files to archive.
-    zip_file_list = [f for f in self.m.path.listdir('build_dir', build_dir)
+    zip_file_list = [f for f in self.m.file.listdir('build_dir', build_dir)
                      if self._cf_should_package_file(f)]
 
     pieces = [self.m.platform.name, target.lower()]
     if archive_subdir_suffix:
       pieces.append(archive_subdir_suffix)
     subdir = '-'.join(pieces)
 
     # Components like v8 get a <name>-v8-component-<revision> infix.
     component = ''
     if revision_dir:
@@ skipping 136 matching lines @@
                                          'archive_dependencies.py')
       args = []
       args.extend(['--src-dir', self.m.path['checkout']])
       args.extend(['--target', target])
       args.extend(['--master', master])
       args.extend(['--builder', builder])
       args.extend(['--build', build])
       self.m.python(step_name, script, args, infra_step=True, **kwargs)
     except self.m.step.StepFailure:
       pass