[Background Sync] Add proper error status to API calls and callbacks
BUG=484306 Review URL: https://codereview.chromium.org/1131943005 Cr-Commit-Position: refs/heads/master@{#329625}
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BUG=484306 Review URL: https://codereview.chromium.org/1131943005 Cr-Commit-Position: refs/heads/master@{#329625}