service/packages: Add revbump_chrome.

BUG=b:187795814
TEST=./run_tests

Change-Id: I1dd365d04d527d4ddc7e3dadb4dd40f1645a84d1
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/2983396
Tested-by: Alex Klein <saklein@chromium.org>
Commit-Queue: Alex Klein <saklein@chromium.org>
Reviewed-by: Sergey Frolov <sfrolov@google.com>
diff --git a/service/packages_unittest.py b/service/packages_unittest.py
index 79b35ab..89049f1 100644
--- a/service/packages_unittest.py
+++ b/service/packages_unittest.py
@@ -8,9 +8,10 @@
 import os
 import re
 
+import pytest
+
 from chromite.third_party.google.protobuf import json_format
 from chromite.third_party.google.protobuf.field_mask_pb2 import FieldMask
-import pytest
 
 import chromite as cr
 from chromite.api.gen.config.replication_config_pb2 import (
@@ -1038,7 +1039,8 @@
       GitRef(
           path='/foo', ref=f'refs/tags/{new_version}', revision='dummycommit')
   ]
-  res = packages.uprev_chrome(build_targets=None, refs=git_refs, chroot=None)
+  res = packages.uprev_chrome_from_ref(build_targets=None, refs=git_refs,
+                                       chroot=None)
 
   modified_file_count = sum(len(m.files) for m in res.modified)
   assert modified_file_count == expected_count