Chrome Version :70.0.3538.77 (Official Build) Revision 0f6ce0b0cd63a12cb4eccea3637b1bc9a29148d9-refs/branch-heads/3538@{#1039}(32/64-Bit)
OS : Windows(7, 8, 8.1 ,10), Mac(10.13.1, 10.14.1, 10.13.6)

Steps to reproduce:
1. Launch chrome, navigate to chrome://flags, click on 'Reset all to default' and relaunch browser.
2. Open NTP, click on 'Gear' icon and click on 'chrome backgrounds'.
3. Select a collection by mouse action, now select a tile and then deselect it(by mouse action).
4. Again try to select a tile and observe. 

Actual Result  : Unable to select a tile for second instance.
Expected Result: Should be able to select a tile for second instance.

This is a regression issue, broken in 'M-70', and below is the bisect info:
Good Build: 70.0.3537.0 (Revision: 587303)
Bad Build : 70.0.3538.0 (Revision: 587811)

Change-Log URL:
https://chromium.googlesource.com/chromium/src/+log/70.0.3537.0..70.0.3538.0?pretty=fuller&n=10000

Suspecting: r587802 ?

@sweilun: 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.Tried per revision bisect on Windows ,Mac and Linux OS but unable to perform the same since getting "RuntimeError: We don't have enough builds to bisect" error 
2.Unable to perform 'chromium bisect' script as issue is not reproducible on chromium builds, hence providing suspect through Manual change-log.
3.Issue is also reproducible on Canary build #72.0.3589.0 and Dev build #71.0.3578.20
4.Issue is specific to remote NTP.

Thank You..!!
 

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