[Background Sync] Remove FireReadyEvents().

This method simply calls FireReadyEventsThenRunCallback() and can be
removed.

Bug: 932591
Change-Id: I3406e9b2f6db55d4cbf5cdd49f572ef92da2e500
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1535865
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@{#643372}
3 files changed