Assess if RBS

Since this only happens on a Beta release, only when deleting a section after the last item was deleting with the swipe gesture (Deleting using the toolbar works fine), and we're really close to submitting M69 I don't think this should be M69 RBS

kkhorimoto@ PTAL it seems there's an issue when removeEmptySections is called, though it might get fixed once iOS12 is not in beta

crrev.com/c/1198104

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/3133b88a72c61683057d7b1970f68d15b67c0c17

commit 3133b88a72c61683057d7b1970f68d15b67c0c17
Author: Kurt Horimoto <kkhorimoto@chromium.org>
Date: Thu Sep 06 19:18:52 2018

[iOS] Defer removing empty sections until editing is stopped.

The swipe to delete gesture for UITableView will throw an exception if
the deleted row's section is removed before the animation finishes.
This CL updates ReadingListTableViewController to defer removing empty
sections until self.tableView.editing is reset to NO at the end of the
swipe animation.

Bug:  877425 ,  877423 
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I74e29b761fc8458e8bb9a6dbe643a73b00a8b9a4
Reviewed-on: https://chromium-review.googlesource.com/1198104
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589237}
[modify] https://crrev.com/3133b88a72c61683057d7b1970f68d15b67c0c17/ios/chrome/browser/ui/reading_list/reading_list_table_view_controller.mm

Verified in 71.0.3545.0 Canary in iPhone 6s plus(iOS 12 beta 12) and iPad Air(iOS 12 beta 12)

Followed the steps mentioned in comment#0. App is not crashing on deleting the last reading list 

Your change meets the bar and is auto-approved for M70. Please go ahead and merge the CL to branch 3538 manually. Please contact milestone owner if you have questions.
Owners: benmason@(Android), kariahda@(iOS), geohsu@(ChromeOS), abdulsyed@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/055c5c8c6483b3ce9cda5e51da6fc94fd8becd5f

commit 055c5c8c6483b3ce9cda5e51da6fc94fd8becd5f
Author: Kurt Horimoto <kkhorimoto@chromium.org>
Date: Mon Sep 10 18:22:23 2018

[iOS] Defer removing empty sections until editing is stopped.

The swipe to delete gesture for UITableView will throw an exception if
the deleted row's section is removed before the animation finishes.
This CL updates ReadingListTableViewController to defer removing empty
sections until self.tableView.editing is reset to NO at the end of the
swipe animation.

Bug:  877425 ,  877423 
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I74e29b761fc8458e8bb9a6dbe643a73b00a8b9a4
Reviewed-on: https://chromium-review.googlesource.com/1198104
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#589237}(cherry picked from commit 3133b88a72c61683057d7b1970f68d15b67c0c17)
Reviewed-on: https://chromium-review.googlesource.com/1217169
Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Cr-Commit-Position: refs/branch-heads/3538@{#232}
Cr-Branched-From: 79f7c91a2b2a2932cd447fa6f865cb6662fa8fa6-refs/heads/master@{#587811}
[modify] https://crrev.com/055c5c8c6483b3ce9cda5e51da6fc94fd8becd5f/ios/chrome/browser/ui/reading_list/reading_list_table_view_controller.mm

Verified in 71.0.3549.0 Canary in iPhone 6s plus(iOS 12 beta 12) and iPad Air(iOS 12 beta 12)

Followed the steps mentioned in comment#0. App is not crashing on deleting the last reading list entry.  Looks good.

Verified in 70.0.3538.17 Beta in iPhone 6s plus(iOS 12 beta 12) and iPad Air(iOS 12 beta 12)

Followed the steps mentioned in comment#0. App is not crashing on deleting the last reading list entry.  Looks good.

Link to video:
https://drive.google.com/file/d/1YX3KzEl6gulfHLs4tMBa6u30ok92sDSC/view?usp=sharing