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- Creates a RecentTabsTableViewController constants file.
- Creates a file for RecentTabsTableViewControllerDelegate protocol.
- Creates Protocol RecentTabsTableViewControllerInterface, this includes all the public
RecentTabsTableViewController methods.
- Renames RecentTabsTableViewController to LegacyRecentTabsTableViewController.
- Small cleanup of unused imports.


Bug: 805013
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Ie682653c2154e22776b0e991db56d52f6d5aab20
Reviewed-on: https://chromium-review.googlesource.com/896923
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536913}