Manually roll recipes.

recipe_engine:
  https://crrev.com/222e52d54fd4816863099034b25b6f74e0e1a06a [package.proto] upgrade to proto3. (iannucci@chromium.org)
  https://crrev.com/70340d7caa58896cbcffcccbc5573dd3b488fc5d [doc/recipes.py] proto3 omits empty fields. (iannucci@chromium.org)
  https://crrev.com/286c6f5ec8db26ee88eae1bd30855a9f3d0cf426 [doc/recipes.py] protobuf is a dict of lists. (iannucci@chromium.org)
  https://crrev.com/78c57c5d69a38ef3db86d9763d539383f98714e6 [doc/recipes.py] Make recipes.py 80-cols. (iannucci@chromium.org)

BUG=

Change-Id: I4c5c9e94e9c64d14ccf0048f1aa392148b5f01c8
Reviewed-on: https://chromium-review.googlesource.com/454888
Commit-Queue: Robbie Iannucci <iannucci@chromium.org>
Reviewed-by: Daniel Jacques <dnj@chromium.org>

infra/config/recipes.cfg

 api_version: 1
 project_id: "depot_tools"
-recipes_path: ""
 deps {
   project_id: "recipe_engine"
   url: "https://chromium.googlesource.com/external/github.com/luci/recipes-py.git"
   branch: "master"
-  revision: "9fdd6d725d8d04125d43ce2be4f5e4b123f705be"
+  revision: "78c57c5d69a38ef3db86d9763d539383f98714e6"
 }

recipes.py

@@ -150,14 +150,15 @@ def main():
     protobuf = parse_protobuf(fh)
 
   engine_buf = get_unique([
-      b for b in protobuf['deps'] if b.get('project_id') == ['recipe_engine'] ])
+      b for b in protobuf.get('deps', [])
+      if b.get('project_id') == ['recipe_engine'] ])
   engine_url = get_unique(engine_buf['url'])
   engine_revision = get_unique(engine_buf['revision'])
   engine_subpath = (get_unique(engine_buf.get('path_override', ['']))
                     .replace('/', os.path.sep))
 
   recipes_path = os.path.join(repo_root,
-      get_unique(protobuf['recipes_path']).replace('/', os.path.sep))
+      get_unique(protobuf.get('recipes_path', [''])).replace('/', os.path.sep))
   deps_path = os.path.join(recipes_path, '.recipe_deps')
   engine_path = find_engine_override(sys.argv[1:])
   if not engine_path: