Chrome Version : 69.0.3481.0 (Official Build) Revision 1256f448450290ca3d700e80543015dc6f028656-refs/branch-heads/3481@{#1} (64 bit)
OS: Mac (10.14)

Steps to reproduce:
1. Launch chrome and open NTP's (at least 15).
2. Now close any NTP except the last NTP and Observe.

Actual Result: Present tabs doesn't resize after closing other tabs.
Expected Result: Present tabs should resize after closing other tabs.

This is a Mac specific Regression issue seen from M-62 series, providing the bisect info below:
Good Build: 62.0.3180.0 (Revision: 492770)
Bad Build:  62.0.3181.0 (Revision: 493197)

You are probably looking for a change made after 492971 (known good), but no later than 492972 (first known bad).

CHANGE-LOG URL:

The script might not always return single CL as suspect as some perf builds might get missing due to failure.

https://chromium.googlesource.com/chromium/src/+log/d5ea6ad9b7b5af521c634c6461227c619b6728a1..1f71c6ec3d33ac53f8e2474fbfd9e6396f731008

Suspect: https://chromium.googlesource.com/chromium/src/+/1f71c6ec3d33ac53f8e2474fbfd9e6396f731008

@sdy: 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. Issue is also seen on M-67 Stable (build #67.0.3396.99), M-68 Beta (build #68.0.3440.42) & M-69 Dev (build #69.0.3472.3).
2. Issue is not reproducible on Mac (10.12.6, 10.13.1, 10.13.6), Win (7, 8, 8.1, 10) & Linux (14.04 LTS).

Kindly refer the attached screen-cast.

Thank You..!!

 

Deleted: Actual Video.mov 3.4 MB

	Actual Video.mov 3.4 MB View Download

Deleted: Expected Video.mov 2.3 MB

	Expected Video.mov 2.3 MB View Download