[Background Sync] Update existing registration

if the options don't match.

Bug: 925297
Change-Id: Ibb92dd0eb7ccedf9f6c235439fc82a903b613854
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1660553
Commit-Queue: Mugdha Lakhani <nator@chromium.org>
Reviewed-by: Rayan Kanso <rayankans@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672143}
3 files changed