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Removing the RBS label; this isn't truly a blocker for release.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/09fba90138a1c3197d0568fec12ceb75217aedf3

commit 09fba90138a1c3197d0568fec12ceb75217aedf3
Author: pnoland <pnoland@chromium.org>
Date: Mon Jun 26 21:38:27 2017

[sync] Fix IsSyncConfirmationNeeded crash when local backend is enabled

signin_ isn't present when local backend is enabled, so we need to avoid
dereferencing it. Other call sites for IsSignedIn() do this check
already.

R=skym@chromium.org
BUG=736118, 736241 

Review-Url: https://codereview.chromium.org/2961673002
Cr-Commit-Position: refs/heads/master@{#482419}

[modify] https://crrev.com/09fba90138a1c3197d0568fec12ceb75217aedf3/components/browser_sync/profile_sync_service.cc
[modify] https://crrev.com/09fba90138a1c3197d0568fec12ceb75217aedf3/components/browser_sync/profile_sync_service_startup_unittest.cc
[modify] https://crrev.com/09fba90138a1c3197d0568fec12ceb75217aedf3/components/browser_sync/profile_sync_service_unittest.cc

The above-referenced patch adds a unit test that test for the specific condition that triggered the bug. I'm going to leave this open for now since we would also benefit from a more general set of tests around sync error indicators. 

While this would be nice to have, it's unlikely to get done any time soon.