Manual regression range:
Good Build: 51.02663.0
Bad Build: 51.02664.0

Narrow bisect info:
https://chromium.googlesource.com/chromium/src/+log/5121a34129f274edc61a288f73f99b39eb06e1e7..b38be38cee2027dcb827ebc61abb23508b8e5d25?pretty=fuller&n=10

Suspecting: 378367 ?

Note: Issue not seen on Win & Linux OS.

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Adding release block label, please undo if not the case.

This is not a regression, per se - it looks like the vertical line is not being drawn when you activate the Material Design flag. This is not code I have worked on or changed so I will have to dig around for the cause or the proper owner.

Actually, can you find someone to look into this? This is not code that I touched. I'm assuming that the in-page find bar is looking for the Material Design flag and drawing itself a bit differently when it's turned on. Someone who has worked on the in-page find code should take a look at it.

@msw: Adding you in the loop, request you to please take a look into it. Please help us in reassign to the right owner for the issue raised.

estade, pkasting?

I only ever touched the Views version of the find in page bar. I don't think anyone has touched the mac FIP code recently, so it seems like shrike's work is the likeliest culprit (or at least qualifies him as a good candidate for tracking down the source of the regression, if it wasn't r378367)

Only a note: The separator is also missing in Non-MaterialDesign Mode.

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This us not a result of any of my changes, and should be assigned to someone familiar with the Find in page code for triage.

... and already broken in Chrome Stable Version 49.0.2623.87 (64-bit)

With response to comment #11 & 13

Rechecked again and found that its seen from M30 series(i.e 30.0.1549.0) with following steps.
1.Launch chrome and open NTP.
2.Press cmd+F key and enter any letter e.g 't', observe separator
3.Enter complete letter e.g 'test' and observe separator

Actual: 
1.Separator appears after entering single letter i.e after step 1&2
2.It vanishes once complete text 'test/tes' is entered.

Please refer attached screenshot & video

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Removing milestone, P3 (since it's been around for 20 milestones already). 

This issue has been available for more than 365 days, and should be re-evaluated. Please re-triage this issue.
The Hotlist-Recharge-Cold label is applied for tracking purposes, and should not be removed after re-triaging the issue.

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

This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

Sorry for the inconvenience if the bug really should have been left as Available.

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

Updates:
Rechecked the above issue on Mac (10.13.1, 10.13.6, 10.14.2) OS using latest Canary build #72.0.3609.3 and the issue not reproducible.
New Find in bubble is seen, hence issue is not reproducible.
Kindly refer the attached screen-cast.
Thank You

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