The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/9aac2244fec338fc40c19994a1ae096032e703f5

commit 9aac2244fec338fc40c19994a1ae096032e703f5
Author: Moe Ahmadi <mahmadi@chromium.org>
Date: Thu Jun 07 04:38:35 2018

[AF][IOS] Removes extra spacing below the close button in CC save infobar

Adds more comments and ascii visuals for improved readablity

Bug:  848820 
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I361b1bf51c7d5dd09fc51374a8604b0d67f83c38
Reviewed-on: https://chromium-review.googlesource.com/1082927
Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Peter Lee <pkl@chromium.org>
Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565181}
[modify] https://crrev.com/9aac2244fec338fc40c19994a1ae096032e703f5/ios/chrome/browser/ui/autofill/save_card_infobar_view.mm

Verified the fix on Chrome iOS Canary 69.0.3453.0

This bug requires manual review: M68 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), kariahda@(iOS), bhthompson@(ChromeOS), abdulsyed@(Desktop)

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

This is a big change. Test team can you also verify this is fixed?

Please see comment #3. I verified the fix on Canary 69.0.3453.0 already.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/7aea38c9c9c0313b560bf3556f71683aa3cc51e9

commit 7aea38c9c9c0313b560bf3556f71683aa3cc51e9
Author: Moe Ahmadi <mahmadi@chromium.org>
Date: Tue Jun 12 19:40:34 2018

[AF][IOS] Removes extra spacing below the close button in CC save infobar

Adds more comments and ascii visuals for improved readablity

Bug:  848820 
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I361b1bf51c7d5dd09fc51374a8604b0d67f83c38
Reviewed-on: https://chromium-review.googlesource.com/1082927
Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Peter Lee <pkl@chromium.org>
Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#565181}(cherry picked from commit 9aac2244fec338fc40c19994a1ae096032e703f5)
Reviewed-on: https://chromium-review.googlesource.com/1097659
Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Cr-Commit-Position: refs/branch-heads/3440@{#309}
Cr-Branched-From: 010ddcfda246975d194964ccf20038ebbdec6084-refs/heads/master@{#561733}
[modify] https://crrev.com/7aea38c9c9c0313b560bf3556f71683aa3cc51e9/ios/chrome/browser/ui/autofill/save_card_infobar_view.mm

Verified in 68.0.3440.30 Beta on iPhone 7plus(iOS 10.3.3), iPhone 8plus(iOS 11.4) and iPad Air(iOS 10.3.3)

No extra space under close button in credit card info bar, looks good

Link to Screenshot:
https://drive.google.com/file/d/1dJIvQkp8ULC6y8thHo9Cyv_T3j7FXUuH/view?usp=sharing