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

scripts/slave/recipe_modules/path/example.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.
 
 DEPS = [
   'path',
   'platform',
   'step',
 ]
 
 
 def GenSteps(api):
   api.step('step1',
                   ['/bin/echo', str(api.path['slave_build'].join('foo'))])
 
-  # listdir demo.
-  result = api.path.listdir('fake dir', '/fake/dir')
-  for element in result:
-    api.step('manipulate %s' % str(element), ['some', 'command'])
-
-  # mkdtemp demo.
-  for prefix in ('prefix_a', 'prefix_b'):
-    # Create temp dir.
-    temp_dir = api.path.mkdtemp(prefix)
-    assert api.path.exists(temp_dir)
-    # Make |temp_dir| surface in expectation files.
-    api.step('print %s' % prefix, ['echo', temp_dir])
-
   # module.resource(...) demo.
   api.step('print resource',
            ['echo', api.path.resource('dir', 'file.py')])
 
-  # rmwildcard demo
-  api.path.rmwildcard('*.o', api.path['slave_build'])
-
 
 def GenTests(api):
   # This line is for code coverage.
   api.path['slave_build'].join('foo')
 
   for platform in ('linux', 'win', 'mac'):
     yield api.test(platform) + api.platform.name(platform)