Re-add the GERRIT_HOST and GERRIT_PORT codereview settings.

Some users get 404s when running 'git cl upload' because gclient attempts
to upload as a reitveld patch.

Change-Id: I8fb5a46480f91489a05fbff918a106312cf0118c
Reviewed-on: https://chromium-review.googlesource.com/301474
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Tested-by: Geoff Lang <geofflang@chromium.org>

codereview.settings

@@ -1,3 +1,5 @@
 # This file is used by git cl to get repository specific information.
 CODE_REVIEW_SERVER: https://chromium-review.googlesource.com
+GERRIT_HOST: chromium-review.googlesource.com
+GERRIT_PORT: 29418
 TRYSERVER_GERRIT_URL: https://chromium-review.googlesource.com