[tools] tools/node/fetch_deps.py returns False.

This will act as a switch so that we can enable Node.js GN builds
via V8 change.

R=machenbach@chromium.org

Bug: v8:6105
Change-Id: Ie786a4dad7f53e4bbf7d8830bb72b1f8031cee12
Reviewed-on: https://chromium-review.googlesource.com/866839Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50612}

tools/node/fetch_deps.py

@@ -89,5 +89,11 @@ def FetchDeps(v8_path):
     if os.path.isfile(gclient_entries):
       os.remove(gclient_entries)
 
+  # TODO(v8:6105):
+  # The return value gates whether Node's configure script actually
+  # uses GN. Change this to true once everything is ready so that
+  # the change to enable the GN build on the bots comes from V8.
+  return False;
+
 if __name__ == "__main__":
   FetchDeps(sys.argv[1])