You are probably looking for a change made after 562969 (known good), but no later than 562979 (first known bad).

Narrow Bisect info : 
https://chromium.googlesource.com/chromium/src/+log/5ecb1c29f9cd7fa027d0c573286f78a55da16188..be652b796af75662f2d0dc64e152d8c90b14f271?pretty=fuller&n=50

Suspecting: r562979 from Narrow bisect

@tommycli: Could you please help to reassign if your change is not the cause for this change.

Note:
1.Unable to provide bisect using per-revision script,Hence providing bisect with old script.
2.Pardon me if it is an intended change then Blue focus highlight also not seen over omnibox even when it is focused.
3.Issue is not seen on Mac(10.12.6,10.13.1,10.13.6) 

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/479e0af586ef7a0b0770312a9f03a13aa72910c2

commit 479e0af586ef7a0b0770312a9f03a13aa72910c2
Author: Tommy C. Li <tommycli@chromium.org>
Date: Fri Jun 01 21:50:31 2018

Omnibox UI Refresh: Fix legacy focus ring for keyboard accessibility

Previously we displayed a legacy focus ring if Material Refresh was off
for full keyboard accessibilty mode on all platforms.

The CL below accidentally removed it:
https://chromium-review.googlesource.com/c/chromium/src/+/1069690

Now we are adding it back with a partial revert - and a refactor to
make the logic overall more clear. We can remove everything we are
adding in this CL once Material Refresh is permanent and launched.

Bug:  848641 ,  844263 ,  823535 
Change-Id: Ife78cd9660e38f16525b55044ee0a231101534a6
Reviewed-on: https://chromium-review.googlesource.com/1082794
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#563814}
[modify] https://crrev.com/479e0af586ef7a0b0770312a9f03a13aa72910c2/chrome/browser/ui/views/location_bar/location_bar_view.cc
[modify] https://crrev.com/479e0af586ef7a0b0770312a9f03a13aa72910c2/chrome/browser/ui/views/location_bar/location_bar_view.h
[modify] https://crrev.com/479e0af586ef7a0b0770312a9f03a13aa72910c2/chrome/browser/ui/views/toolbar/toolbar_view.cc
[modify] https://crrev.com/479e0af586ef7a0b0770312a9f03a13aa72910c2/chrome/browser/ui/views/toolbar/toolbar_view.h

Update : 
Rechecked this issue on Windows (7,8,8.1,10) and Linux (14.04 LTS) OS with latest Canary Chrome version: 69.0.3451.0 and the issue is fixed.Kindly refer attached screen cast for your reference.

Deleted: Fixed_video.mp4 320 KB

	Fixed_video.mp4 320 KB View Download

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e41d3cc0b23587b7dde5ebad20a69227b341de28

commit e41d3cc0b23587b7dde5ebad20a69227b341de28
Author: Tommy C. Li <tommycli@chromium.org>
Date: Tue Jun 26 23:56:49 2018

[Merge to M68] Omnibox UI Refresh: Always show the focus ring when focused

This merge comprises of the following two CLs together, since the
intermediate state is broken:

Omnibox UI Refresh: Always show the focus ring when focused

Previously, we only showed the focus ring on certain platforms (Mac) or
keyboard accessibility mode.

Now, following the new Material Refresh guidelines, we display the focus
ring on the Omnibox whenever it is focused (and the popup is hidden).

This also simplifies the code a bit, as keyboard accessibility mode is
no longer relevant.

Bug:  844263 ,  823535 
Change-Id: Ic5133463f6e67af5ef6f0512034938e4a19a9972
Reviewed-on: https://chromium-review.googlesource.com/1069690
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#562979}

(cherry picked from commit be652b796af75662f2d0dc64e152d8c90b14f271)

Omnibox UI Refresh: Fix legacy focus ring for keyboard accessibility

Previously we displayed a legacy focus ring if Material Refresh was off
for full keyboard accessibilty mode on all platforms.

The CL below accidentally removed it:
https://chromium-review.googlesource.com/c/chromium/src/+/1069690

Now we are adding it back with a partial revert - and a refactor to
make the logic overall more clear. We can remove everything we are
adding in this CL once Material Refresh is permanent and launched.

(cherry picked from commit 479e0af586ef7a0b0770312a9f03a13aa72910c2)

Bug:  848641 ,  844263 ,  823535 
Change-Id: Ife78cd9660e38f16525b55044ee0a231101534a6
Reviewed-on: https://chromium-review.googlesource.com/1082794
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Tommy Li <tommycli@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#563814}
Reviewed-on: https://chromium-review.googlesource.com/1115432
Reviewed-by: Tommy Li <tommycli@chromium.org>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Cr-Commit-Position: refs/branch-heads/3440@{#543}
Cr-Branched-From: 010ddcfda246975d194964ccf20038ebbdec6084-refs/heads/master@{#561733}
[modify] https://crrev.com/e41d3cc0b23587b7dde5ebad20a69227b341de28/chrome/browser/ui/views/location_bar/location_bar_view.cc
[modify] https://crrev.com/e41d3cc0b23587b7dde5ebad20a69227b341de28/chrome/browser/ui/views/location_bar/location_bar_view.h
[modify] https://crrev.com/e41d3cc0b23587b7dde5ebad20a69227b341de28/chrome/browser/ui/views/toolbar/toolbar_view.cc
[modify] https://crrev.com/e41d3cc0b23587b7dde5ebad20a69227b341de28/ui/views/controls/focus_ring.cc
[modify] https://crrev.com/e41d3cc0b23587b7dde5ebad20a69227b341de28/ui/views/controls/focus_ring.h

Update : 
Rechecked this issue on Windows (7,8,8.1,10) and Linux (14.04 LTS) OS using Beta build : 68.0.3440.42 and the issue is fixed.Hence adding TE-Verified Labels.

Kindly refer attached screen cast for your reference. 

Deleted: Fixed_behavior.mp4 226 KB

	Fixed_behavior.mp4 226 KB View Download