Node integration: Update fetch_deps.py to return depot_tools path

NOTRY=true
NOTREECHECKS=true

Change-Id: I6a9f671a9c3db4fb2eb346ccdf80a10d3e7a5040
Reviewed-on: https://chromium-review.googlesource.com/1025952Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52760}

tools/node/fetch_deps.py

@@ -89,8 +89,8 @@ def FetchDeps(v8_path):
         os.path.join(v8_path, os.pardir, ".gclient_entries"))
     if os.path.isfile(gclient_entries):
       os.remove(gclient_entries)
-  # Enable building with GN for configure script.
-  return True
+
+  return depot_tools
 
 
 if __name__ == "__main__":