Chrome Version : 72.0.3622.0 (Official Build) 74770d660797220710701b2c66ad38390ab86d43-refs/branch-heads/3622@{#1} 64 bit
OS : Mac(10.13.6, 10.13.1, 10.14.2)

What steps will reproduce the problem?
1. Launch chrome, open two NTPs and open print preview on first NTP.
2. Detach second NTP and make it a separate tab.
3. Now try to merge the detached NTP with existing NTP (with print preview window opened).
4. Observe.

Actual Result : Unable to merge detached tab into existing window that has print preview opened.

Expected Result : Chrome should allow user to merge a tab into window that has print preview opened.

This is a regression issue broken in M-72 and below is the bisect information:
Good Build : 72.0.3608.0 (Revision : 607124)
Bad Build : 72.0.3609.3 (Revision : 607406)

Chromium bisect URL:
https://chromium.googlesource.com/chromium/src/+log/a8c2d37b39b145d0db98727abdd50280c3c10813..1d9fadb68d4d71aa3d9539cf16dbc8c7fb98c095

Suspecting : r607224 

lgrey@ : Could you please check whether this is caused with respect to your change, if not please help us in assigning it to the right owner.

Note:

1. Unable to reproduce issue in Windows (7,8,10) and Linux(14.04 LTS) OS.
2. Bisecting with 'per-revision' script shows an error "We don't have enough builds to bisect", hence provided suspect through Chromium bisect.
3. Able to repro issue in Dev #72.0.3610.2

Thank you..!
 

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