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

scripts/slave/recipes/crashpad/continuous.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.
 
 """Buildbot recipe definition for the various Crashpad continuous builders.
 """
 
 DEPS = [
+  'file',
   'gclient',
   'path',
   'platform',
   'properties',
   'python',
   'step',
 ]
 
 
 def GenSteps(api):
   """Generates the sequence of steps that will be run by the slave."""
   api.gclient.set_config('crashpad')
   api.gclient.checkout()
 
   if 'clobber' in api.properties:
-    api.path.rmtree('out', api.path['checkout'].join('out'))
+    api.file.rmtree('out', api.path['checkout'].join('out'))
 
   api.gclient.runhooks()
 
   buildername = api.properties['buildername']
   dirname = 'Debug' if '_dbg' in buildername else 'Release'
   path = api.path['checkout'].join('out', dirname)
   api.step('compile with ninja', ['ninja', '-C', path])
   api.python('run tests',
              api.path['checkout'].join('build', 'run_tests.py'),
              args=[dirname])
 
 
 def GenTests(api):
   tests = [
       'crashpad_mac_dbg',
       'crashpad_mac_rel',
       'crashpad_win_dbg',
       'crashpad_win_rel',
   ]
   for t in tests:
     yield(api.test(t) + api.properties.generic(buildername=t))
     yield(api.test(t + '_clobber') +
           api.properties.generic(buildername=t, clobber=True))