depot_tools: Include httplib2 using vpython.

Bug: 1002153
Change-Id: I940b9d834c2f76caab2bd86fc5d5d5c3b03b4b46
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1871763
Reviewed-by: Anthony Polito <apolito@google.com>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
diff --git a/gerrit_util.py b/gerrit_util.py
index de1251a..8af187b 100644
--- a/gerrit_util.py
+++ b/gerrit_util.py
@@ -14,6 +14,7 @@
 import contextlib
 import cookielib
 import httplib  # Still used for its constants.
+import httplib2
 import json
 import logging
 import netrc
@@ -35,7 +36,6 @@
 import metrics
 import metrics_utils
 import subprocess2
-from third_party import httplib2
 
 LOGGER = logging.getLogger()
 # With a starting sleep time of 1.5 seconds, 2^n exponential backoff, and seven