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So that it can be componentized. Chrome specific logic has been moved to
BackgroundSyncDelegateImpl.

Bug: 1087486, 1091211
Change-Id: Ie4e220c563d48072e719524aad39bed50f9b101b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2454071
Commit-Queue: Mugdha Lakhani <nator@chromium.org>
Reviewed-by: Josh Karlin <jkarlin@chromium.org>
Reviewed-by: Rayan Kanso <rayankans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814682}