The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ce0a474e2d38395dc0c985b00900c486980c4f76

commit ce0a474e2d38395dc0c985b00900c486980c4f76
Author: Jean-François Geyelin <jif@chromium.org>
Date: Wed Oct 25 12:34:11 2017

Add specific autolayout constraints for the Toolbar on iPad.

The experimental flag "Safe Area Compatible Toolbar" makes the Toolbar
be laid out with autolayout. Before this CL, enabling this flag made
the Toolbar be aligned with the top of the screen, like on iPhone.

Bug:  777948 
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I83db7b5ed345b7336324f369d3b1dec175c12b4b
Reviewed-on: https://chromium-review.googlesource.com/735549
Commit-Queue: Jean-François Geyelin <jif@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#511427}
[modify] https://crrev.com/ce0a474e2d38395dc0c985b00900c486980c4f76/ios/chrome/browser/ui/browser_view_controller.mm

[Auto-generated comment by a script] We noticed that this issue is targeted for M-63; it appears the fix may have landed after branch point, meaning a merge might be required. Please confirm if a merge is required here - if so add Merge-Request-63 label, otherwise remove Merge-TBD label. Thanks.

The bug is marked as P3 or Feature. It should not be merged as M63 is in beta. 
Please contact the approriate milestone owner if you have questions.
Owners: cmasso@(Android), cmasso@(iOS), gkihumba@(ChromeOS), govind@(Desktop)

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

This is actually a P1

This bug requires manual review: M63 has already been promoted to the beta branch, so this requires manual review
Please contact the milestone owner if you have questions.
Owners: cmasso@(Android), cmasso@(iOS), gkihumba@(ChromeOS), govind@(Desktop)

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

Has this been verified in Canary?

cmasso@: This is for iPhone X. We cannot verify in Canary as it is simulator only at the moment.

This issue has been approved for a merge. Please merge the fix to any appropriate branches as soon as possible!

If all merges have been completed, please remove any remaining Merge-Approved labels from this issue.

Thanks for your time! To disable nags, add the Disable-Nags label.

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

Removing the M63 merge request as the flag won't be enabled in M63.

Then this is no more a blocker as well.

Tested this today, this fix is not reflecting in the following Builds

Build : 63.0.3239.48 beta
iOS   : 10.3.3, 11.2, 11.1.1
Device: iPad, iPad mini, iPhone X

I believe this was fixed by https://chromium-review.googlesource.com/735549