[skia] convert recipes and module to new context module

This is a syntax-only change to convert to the new (documented) context
module.

R=borenet@google.com

Bug: skia:
Change-Id: Id907c309d3cf38b85a46f6d8d7ce90ed58ba026f
Reviewed-on: https://skia-review.googlesource.com/16840
Commit-Queue: Eric Boren <borenet@google.com>
Reviewed-by: Eric Boren <borenet@google.com>
diff --git a/infra/bots/recipes/test.py b/infra/bots/recipes/test.py
index 27bc301..9b709f0 100644
--- a/infra/bots/recipes/test.py
+++ b/infra/bots/recipes/test.py
@@ -11,6 +11,7 @@
   'core',
   'env',
   'flavor',
+  'recipe_engine/context',
   'recipe_engine/json',
   'recipe_engine/path',
   'recipe_engine/platform',
@@ -723,11 +724,11 @@
 
 def RunSteps(api):
   api.core.setup()
-  env = api.step.get_from_context('env', {})
+  env = {}
   if 'iOS' in api.vars.builder_name:
     env['IOS_BUNDLE_ID'] = 'com.google.dm'
     env['IOS_MOUNT_POINT'] = api.vars.slave_dir.join('mnt_iosdevice')
-  with api.step.context({'env': env}):
+  with api.context(env=env):
     try:
       api.flavor.install_everything()
       test_steps(api)