build: roll infra_paths changes

scripts/slave/recipes/webrtc/ios.py

 # Copyright 2016 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 = [
   'depot_tools/bot_update',
   'depot_tools/gclient',
+  'depot_tools/infra_paths',
   'ios',
   'recipe_engine/path',
   'recipe_engine/platform',
   'recipe_engine/properties',
   'webrtc'
 ]
 
 
 def RunSteps(api):
   api.gclient.set_config('webrtc_ios')
 
   api.ios.host_info()
   api.bot_update.ensure_checkout()
-  api.path['checkout'] = api.path['slave_build'].join('src')
+  api.path['checkout'] = api.infra_paths['slave_build'].join('src')
 
   build_config_dir = api.path['checkout'].join(
       'webrtc',
       'build',
       'ios',
       api.properties['mastername'],
   )
   include_dir = api.path['checkout'].join(
       'webrtc',
       'build',
@@ skipping 190 matching lines @@
           'os': '7.1',
         },
       ],
     })
     + api.step_data(
       'fake tests 1 (fake device iOS 8.0)',
       retcode=2,
     )
   )