Version: 52.0.2743.24 Revision 334afe94883b731af3eacab708ac03ba796d5c5b-refs/branch-heads/2743@{#181} (32/64-bit) 
OS: Windows (7,8,8.1,10), Mac (10.10.5, 10.11.4), Linux (Ubuntu 14.04 LTS)

What steps will reproduce the problem?
1) Launch chrome, open NTP and open Devtools (Ctrl+Shift+I) and select 'Sources' tab.
2) Click on 'Snippets' tab, mouse hover on it and observe.

On mouse hover Snippets tab, Grey background is seen.

On mouse hover Snippets tab, Grey background should not be seen as it is already selected.

This is a Regression issue broken in M-49 series, below is the bisect info
Manual bisect
Good build: 49.0.2616.0 
Bad build: 49.0.2618.0 

Narrow bisect URL:
https://chromium.googlesource.com/chromium/src/+log/2b310e5ac855ddb1232d0aec667d50a30580728c..cf26399102d9c004f26081fd74fcb70e644e011f?pretty=fuller&n=10

Suspecting: r368499


 

Deleted: devtools_actual.mp4 494 KB

devtools_actual.mp4 494 KB Download

Deleted: devtools_expected.mp4 292 KB

devtools_expected.mp4 292 KB Download