Revert of Cross-repo recipe package system.

scripts/slave/recipes/gatekeeper.py

Index: scripts/slave/recipes/gatekeeper.py
diff --git a/scripts/slave/recipes/gatekeeper.py b/scripts/slave/recipes/gatekeeper.py
index a09b5feddbf2a48d66196d2f035f7da4e6dd3607..f3110a5ed44977a7ab5a81b25d36ee30d59736d6 100644
--- a/scripts/slave/recipes/gatekeeper.py
+++ b/scripts/slave/recipes/gatekeeper.py
@@ -19,11 +19,25 @@
 
 
 def GenTests(api):
+  # It is okay to use os here because we are reading the file immediately
+  # on the simulating machine.
+  import os
+
   yield (
     api.test('basic')
     + api.step_data(
       'reading gatekeeper_trees.json',
       api.gatekeeper.fake_test_data(),
+    )
+  )
+
+  yield (
+    api.test('real')
+    + api.step_data(
+      'reading gatekeeper_trees.json',
+      api.gatekeeper.read_real_config(
+        os.path.join('scripts', 'slave', 'gatekeeper_trees.json')
+      ),
     )
   )