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There are certain requirements wrt. how sync should behave when a tab
is closed. This patch introduces the first related integration tests,
which reflect current behavior and most notably include the need to sync
history for navigations issued immediately before closing a tab.

Bug: 882489
Change-Id: I255a5082f4a75a24d91ef4be443324094427bd1e
Reviewed-on: https://chromium-review.googlesource.com/c/1355127
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612372}