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The fix consists to let the SyncAuthManager do a retry to fetch the access token when the first request is canceled.

Bug: 1050313
Change-Id: I173830f5b28b9fe2ec2a2d67032b52fc2eef344e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2062294
Commit-Queue: Vincent Boisselle <vincb@google.com>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746051}