Chrome Version: 51.0.2704.36 (Official Build)b443e01d2f1387ae22bf871dc6ca1468a85b6619-refs/branch-heads/2704@{#367} 32/64-bit.
OS: Windows(7,8,10), Mac(10.10.5, 10.11.4), Linux(Ubuntu 14.04 LTS)

What steps will reproduce the problem?
1. Launch chrome, sign in to chrome with valid credentials and navigate to chrome://settings/syncSetup page.
2. Select 'Choose what to sync' from drop down list and uncheck 'Credit card and addresses using Google Payment' checkbox.
3. Now uncheck the 'Autofill' checkbox and then again check it and observe the 'Credit card and addresses using Google Payment' checkbox.

Unnecessary 'Credit card and addresses using Google Payment' checkbox is get checked.
'Credit card and addresses using Google Payment' checkbox should not get checked.

Note: In guild build "Credit card and addresses using Google Payment" checkbox is presented in chrome://settings/autofill page.

This is a regression issue, seen from M-49 series, below is bisect info.

Manual regression range:

Good build: 49.0.2622.0 
Bad build: 49.0.2623.0

Unable to sign-in to chromium build hence providing change log.
Change-log URL:
https://chromium.googlesource.com/chromium/src/+log/49.0.2622.0..49.0.2623.0?pretty=fuller&n=10000

Suspecting: r369763

Kindly review the attached screen-cast for reference.
 

Deleted: Actual_behavior.mp4 991 KB

Actual_behavior.mp4 991 KB Download

Deleted: Expected_behavior.mp4 1.7 MB

Expected_behavior.mp4 1.7 MB Download