Revert of Removed virtualenv from depot_tools

third_party/cq_client/validate_config.py

Index: third_party/cq_client/validate_config.py
diff --git a/third_party/cq_client/validate_config.py b/third_party/cq_client/validate_config.py
index 51fa7cf2b30daf240664a778270f0339dfcc20b8..17d91dbb32c72d329427cf167b1ea2369a4f6849 100644
--- a/third_party/cq_client/validate_config.py
+++ b/third_party/cq_client/validate_config.py
@@ -6,14 +6,7 @@
 """CQ config validation library."""
 
 import argparse
-# This file was originally copied together with the cq_client library from the
-# internal commit_queue repository and then modified to import protobuf26
-# instead of google.protobuf to prevent conflicts with a different version of
-# google.protobuf that some users of depot_tools have installed. If you need to
-# update this file, please make similar changes again and add this comment back.
-# More details on why we chose to rename the package can be found in the file
-# depot_tools/third_party/protobuf26/README.chromium.
-import protobuf26 as protobuf
+from google import protobuf
 import logging
 import re
 import sys