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If the last tab is closed, it won't be removed from the "Tabs from other
devices" list. This CL fixes it by sending the latest state even if
there are no tabs left in window.

After current CL the window is considered syncable if it is not about to
be closed (regardless of the number of tabs).

Bug: 1039234
Change-Id: I15c61b38a6bbd53ea158b216644cd27655f8c4dd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2485261Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Rushan Suleymanov <rushans@google.com>
Cr-Commit-Position: refs/heads/master@{#826844}