lib: constants: change DEPOT_TOOLS_DIR to Path

BUG=None
TEST=CQ passes

Change-Id: I561b931a4aead9c9b313315a2ca3daf4f1cc0b81
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/4374323
Reviewed-by: Lizzy Presland <zland@google.com>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
diff --git a/scripts/sync_chrome.py b/scripts/sync_chrome.py
index 1dc9929..d9408c0 100644
--- a/scripts/sync_chrome.py
+++ b/scripts/sync_chrome.py
@@ -6,7 +6,6 @@
 
 import argparse
 import logging
-import os
 
 from chromite.lib import commandline
 from chromite.lib import constants
@@ -82,7 +81,7 @@
         parser.error("--gclient can not be an empty string!")
     gclient_path = options.gclient or osutils.Which("gclient")
     if not gclient_path:
-        gclient_path = os.path.join(constants.DEPOT_TOOLS_DIR, "gclient")
+        gclient_path = constants.DEPOT_TOOLS_DIR / "gclient"
 
     try:
         if options.reset: