GitLab

KeyboardCommandsTestCase:
- Updates the recent tabs test now that recent tabs is always presented
  and never contained.
- Updates the recent tabs test because the a11y ID of the "Done" button
  is different when the UIRefresh flag is enabled.

RecentTabsTableTestCase:
- Properly nils out the mediator after it is disconnected.  This
  prevents a crash when launching recent tabs a second time.

BUG=825431

Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Ib97c1536083fae82dcc523c8ea2787c74f92469b
Reviewed-on: https://chromium-review.googlesource.com/995617Reviewed-by: Sergio Collazos <sczs@chromium.org>
Commit-Queue: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548061}