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GCM token may become invalid (it is stored on disk and may be corrupted).
Therefore, this CL adds a periodical check (at least 24 hours, without waking
up) of the current token validity. If it is invalid, then a new token is
retrieved and used to resubscribe to our server.

Bug: 742240
Change-Id: I27d873049c6dbc7ff8c3ad0471cf20ca7f754d53
Reviewed-on: https://chromium-review.googlesource.com/574232Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: vitaliii <vitaliii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491956}