Fix presubmit recipe to fetch description from rietveld.

scripts/slave/recipes/run_presubmit.py

Index: scripts/slave/recipes/run_presubmit.py
diff --git a/scripts/slave/recipes/run_presubmit.py b/scripts/slave/recipes/run_presubmit.py
index 44f5a16149746cbac111db93927a4949d9f997a7..28318e999bf94467f9d6884fcd358cb8988be9bb 100644
--- a/scripts/slave/recipes/run_presubmit.py
+++ b/scripts/slave/recipes/run_presubmit.py
@@ -28,13 +28,13 @@ def GetFactoryProperties(api, factory_properties, build_properties):
         '--root', api.checkout_path(),
         '--commit',
         '--verbose', '--verbose',
-        '--author', build_properties['blamelist'][0],
         '--issue', build_properties['issue'],
         '--patchset', build_properties['patchset'],
         '--skip_canned', 'CheckRietveldTryJobExecution',
         '--skip_canned', 'CheckTreeIsOpen',
         '--skip_canned', 'CheckBuildbotPendingBuilds',
         '--skip_canned', 'CheckOwners',
-        '--rietveld_url', build_properties['rietveld']])
+        '--rietveld_url', build_properties['rietveld'],
+        '--rietveld_fetch'])
     ]
   }