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

scripts/slave/recipe_modules/syzygy/api.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.
 
 import ast
 import os
 import re
 
 from slave import recipe_api
 
@@ skipping 275 matching lines @@
     assert self.m.chromium.c.BUILD_CONFIG == 'Release' and self.c.official_build
     archive_symbols_py = self.m.path['checkout'].join(
         'syzygy', 'internal', 'scripts', 'archive_symbols.py')
     kasko_dll = self.output_dir.join('*kasko.dll')
     args = ['-s', '-b', kasko_dll]
     return self.m.python('upload_symbols', archive_symbols_py, args)
 
   def clobber_metrics(self):
     """Returns a step that clobbers an existing metrics file."""
     # TODO(chrisha): Make this whole thing use the JSON output mechanism.
-    return self.m.path.rmwildcard('metrics.csv', self.output_dir)
+    return self.m.file.rmwildcard('metrics.csv', self.output_dir)
 
   def archive_metrics(self):
     """Returns a step that archives any metrics collected by the unittests.
     This can be called from any build configuration.
     """
     # Determine the name of the archive.
     config = self.m.chromium.c.BUILD_CONFIG
     if config == 'Release' and self.c.official_build:
       config = 'Official'
     archive_path = 'builds/metrics/%s/%s.csv' % (self.revision, config.lower())
@@ skipping 14 matching lines @@
             '--overwrite',
             '--verbose']
     return self.m.python('download_binaries', get_syzygy_binaries_py, args)
 
   def smoke_test(self):
     """Returns a step that launches the smoke test script."""
     smoke_test_py = self.internal_scripts_dir.join('smoke_test.py')
     build_dir = self.m.path['checkout'].join('build')
     args = ['--verbose', '--build-dir', build_dir]
     return self.m.python('smoke_test', smoke_test_py, args)