Import gclient_utils for gclient_paths CheckCallAndFilter

CheckCallAndFilter isn't part of the global namespace, and as a result,
this call was silently failing.

BUG=1007553

Change-Id: Ie2f3135fc3d56be189d8be0fe996a068e0645705
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1823664
Auto-Submit: Robert Liao <robliao@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Robert Liao <robliao@chromium.org>

gclient_paths.py

@@ -10,6 +10,7 @@
 
 from __future__ import print_function
 
+import gclient_utils
 import os
 import sys
 
@@ -71,8 +72,9 @@ def GetPrimarySolutionPath():
       if os.path.exists(repo_root_path):
         top_dir[0] = repo_root_path
     try:
-      CheckCallAndFilter(["git", "rev-parse", "--show-toplevel"],
-                         print_stdout=False, filter_fn=filter_fn)
+      gclient_utils.CheckCallAndFilter(["git", "rev-parse", "--show-toplevel"],
+                                       print_stdout=False,
+                                       filter_fn=filter_fn)
     except Exception:
       pass
     top_dir = top_dir[0]