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FCM registration token can become invalid. This CL re-requests the token once a day and notifies token observers in case token has become invalid.

Code is mostly copied from the old invalidations implementation (components/invalidation/impl/fcm_network_handler.*).

Change-Id: I67ad7e4f315e38bc8d34710ca4551ebd2e080ade
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2391071
Commit-Queue: Paula Vidas <paulavidas@google.com>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804730}