Migrate to the HTTP interface for interacting with gerrit.

The gerrit service for chromium projects will migrate from a
stand-alone gerrit server, accessed primarily using an ssh interface,
to the gerrit-on-borg service, which uses an HTTP interface.

BUG=219617
TEST=https://gerrit.chromium.org/gerrit/#/c/59366/

Change-Id: I8f5423a36321cbc5ac31789d4cdc394a964051e4
Reviewed-on: https://gerrit.chromium.org/gerrit/56868
Commit-Queue: Stefan Zager <szager@google.com>
Reviewed-by: Stefan Zager <szager@google.com>
Tested-by: Stefan Zager <szager@google.com>
diff --git a/scripts/gerrit.py b/scripts/gerrit.py
index 3da6a21..92282bd 100644
--- a/scripts/gerrit.py
+++ b/scripts/gerrit.py
@@ -313,7 +313,7 @@
         opts.internal = True
       args[1] = args[1][1:]
 
-  opts.gerrit = gerrit.GerritHelper.FromRemote(
+  opts.gerrit = gerrit.GetGerritHelper(
       constants.INTERNAL_REMOTE if opts.internal else constants.EXTERNAL_REMOTE,
       print_cmd=opts.debug)