Revert of Delete tryserver_gerrit and its old properties.

recipe_modules/properties/example.expected/buildbot_tryserver_gerrit_deprecated.json

+[
+  {
+    "cmd": [
+      "echo",
+      "None",
+      "'thing'"
+    ],
+    "name": "echo"
+  },
+  {
+    "cmd": [
+      "echo",
+      "('blamelist', ['cool_dev1337@chromium.org', 'hax@chromium.org'])",
+      "('branch', '')",
+      "('buildbotURL', 'http://c.org/p/cr/')",
+      "('buildername', 'TestBuilder')",
+      "('buildnumber', 571)",
+      "('category', 'cq')",
+      "('event.change.id', u'infra%2Finfra~master~Ideadbeaf')",
+      "('event.change.number', 338811)",
+      "('event.change.url', u'https://pdfium-review.googlesource.com/#/c/338811')",
+      "('event.patchSet.ref', u'refs/changes/11/338811/3')",
+      "('foo.bar-bam', 'thing')",
+      "('gerrit', 'https://pdfium-review.googlesource.com')",
+      "('mastername', 'chromium.testing.master')",
+      "('patch_project', 'infra/infra')",
+      "('patch_storage', 'gerrit')",
+      "('project', 'infra/infra')",
+      "('reason', 'CQ')",
+      "('recipe', 'properties:example')",
+      "('repository', 'https://pdfium.googlesource.com/infra/infra')",
+      "('requester', 'commit-bot@chromium.org')",
+      "('revision', 'HEAD')",
+      "('slavename', 'TestSlavename')",
+      "('test_prop', None)",
+      "('workdir', '/path/to/workdir/TestSlavename')"
+    ],
+    "name": "echo all"
+  },
+  {
+    "name": "$result",
+    "recipe_result": null,
+    "status_code": 0
+  }
+]