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https://crbug.com/1032348 tells us that there are browsers with no
active tab in some cases when --restore-last-session is specified. To
get a better undertanding of the problem, this CL adds a CHECK to
get a crash report if a Browser doesn't have an active tab at the
end of SessionRestoreImpl::ProcessSessionWindows().

Bug: 1032348
Change-Id: Ic6919429ba9a1ece3a21230c0d63c9d2bb2a79bb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1966523
Commit-Queue: Chris Hamilton <chrisha@chromium.org>
Reviewed-by: Chris Hamilton <chrisha@chromium.org>
Cr-Commit-Position: refs/heads/master@{#725989}