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This CL creates ReadingListCoordinator, which uses UITableViews and
replaces the old UICollectionView-based implementation.

Bug: 805209
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I59acbe85cb389c69462bb72ddb7858acb1249c55
Reviewed-on: https://chromium-review.googlesource.com/1104941
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572157}