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testClosedTabAppearsInRecentTabsPanel, testOpenHistory and testRecentTabSigninPromoReloaded
were failing because of missing A11y info and because we weren't updating the mediator correctly
on start.
testRecentTabSigninPromoReloadedWhileHidden was failing because RecentTabsTableVC implementation
wasn't updating the SignInPromoItem configuraton when the section was collapsed.

Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I9d89501a0285914bc15897d0bdaf48d080f0455b
Reviewed-on: https://chromium-review.googlesource.com/990588
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547722}