This doesn't seem as important as other bugs; dropping to P3 unless you object

The first issue has been solved. 

The second one needs to be fixed.

+martijnb since he originally spotted this.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/58d359035fcdf8ef47d26f53ddd56f6db24c4373

commit 58d359035fcdf8ef47d26f53ddd56f6db24c4373
Author: sczs <sczs@chromium.org>
Date: Mon Aug 13 16:50:17 2018

[iOS] Fixes Bookmark FolderVC navigationBar background.

Previously the Choose Folder Bookmark VC NavigationBar
had a gray background. This was caused because the
NavigationBar clear background didn't have content under
because setEdgesForExtendedLayout was trimming the tableView.

This CL also prevents a largeTitle to be displayed whenever
this VC is pushed, following the mocks.

Bug:  855323 
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I45917d2cf467dcd793ac6dfc335e10b4d1ef2eb5
Reviewed-on: https://chromium-review.googlesource.com/1171791
Reviewed-by: edchin <edchin@chromium.org>
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582614}
[modify] https://crrev.com/58d359035fcdf8ef47d26f53ddd56f6db24c4373/ios/chrome/browser/ui/bookmarks/bookmark_edit_view_controller.mm
[modify] https://crrev.com/58d359035fcdf8ef47d26f53ddd56f6db24c4373/ios/chrome/browser/ui/bookmarks/bookmark_folder_view_controller.mm

Verified in 70.0.3529.0 Canary in iPhone 8plus(iOS 11.4.1), iPad Air(iOS 12 beta 9), iPhone 7 plus(iOS 10.3.3)

Bookmark Navigation bar and title looks good, please look at the below recorded video for reference

Link to video:
https://drive.google.com/file/d/1JYXinDEGm2CjqnLXeOrWdhFN8i48CLa7/view?usp=sharing