Roll recipe dependencies (trivial).

This is an automated CL created by the recipe roller. This CL rolls recipe
changes from upstream projects (e.g. depot_tools) into downstream projects
(e.g. tools/build).


More info is at https://goo.gl/zkKdpD. Use https://goo.gl/noib3a to file a bug.
recipe_engine:
  https://crrev.com/d878bba594c81c7ba4cc16b8bf078097b00a102d [recipe_modules/file] add real file module to engine. (iannucci@chromium.org)


TBR=iannucci@chromium.org

Recipe-Tryjob-Bypass-Reason: Autoroller
Bugdroid-Send-Email: False
Change-Id: I0f11eb017b42f090cc49c0c4a325205a2e92e504
Reviewed-on: https://chromium-review.googlesource.com/520644Reviewed-by: Recipe Roller <recipe-roller@chromium.org>
Commit-Queue: Recipe Roller <recipe-roller@chromium.org>

infra/config/recipes.cfg

@@ -15,7 +15,7 @@
   "deps": {
     "recipe_engine": {
       "branch": "master",
-      "revision": "8ff178b2ec0c099d49ecb1df1c411f487c6bc657",
+      "revision": "d878bba594c81c7ba4cc16b8bf078097b00a102d",
       "url": "https://chromium.googlesource.com/external/github.com/luci/recipes-py.git"
     }
   },