Stop supporting old Gerrit CQ tryjob properties.

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 295de3bb16c743ebd703844c7f97a0cb8f158ca9..29a2f8f6028641ae48db5407b5ce6a3c1806b704 100644
--- a/scripts/slave/recipes/run_presubmit.py
+++ b/scripts/slave/recipes/run_presubmit.py
@@ -77,19 +77,10 @@ def _RunStepsInternal(api):
     else:
       presubmit_args.extend(['--rietveld_email', ''])  # activate anonymous mode
   elif patch_storage == 'gerrit':
-    gerrit_url = api.properties.get('patch_gerrit_url')
-    if not gerrit_url:
-      # TODO(tandrii): clean up old Gerrit patch properties.
-      # Field event.patchSet.ref looks like 'refs/changes/11/338811/4'
-      issue, patchset = api.properties['event.patchSet.ref'].split('/')[-2:]
-      gerrit_url = api.properties['gerrit']
-    else:
-      issue = api.properties.get('patch_issue')
-      patchset = api.properties.get('patch_set')
     presubmit_args = [
-      '--issue', issue,
-      '--patchset', patchset,
-      '--gerrit_url', gerrit_url,
+      '--issue', api.properties['patch_issue'],
+      '--patchset', api.properties['patch_set'],
+      '--gerrit_url', api.properties['patch_gerrit_url'],
       '--gerrit_fetch',
     ]
   else:  # pragma: no cover
@@ -187,18 +178,6 @@ def GenTests(api):
   )
 
   yield (
-    api.test('infra_with_runhooks_and_gerrit_deprecated') +
-    api.properties.tryserver_gerrit(
-        full_project_name='infra/infra',
-        repo_name='infra',
-        mastername='tryserver.infra',
-        buildername='infra_presubmit',
-        runhooks=True) +
-    api.step_data('presubmit', api.json.output([['infra_presubmit',
-                                                 ['compile']]]))
-  )
-
-  yield (
     api.test('infra_with_runhooks_and_gerrit') +
     api.properties.tryserver(
         gerrit_project='infra/infra',