GitLab

These variables were left unused after
https://chromium.googlesource.com/chromium/src/+/23e63803fbf9a7aaf0a6107e36ea9c2ef6857d95%5E%21/#F1

BUG=None
TEST=components_unittests --gtest_filter=BookmarkCodecTest.*
R=sky@chromium.org

Review URL: https://codereview.chromium.org/889473002

Cr-Commit-Position: refs/heads/master@{#313908}