App Version: 56.0.2924.42 dev
iOS Version: 9.3.5, iOS 10
Device: iPhone,iPad

PreCondition :  
1.Enable Voiceover in device settings.

Steps to reproduce:
 1. Launch chrome and Sign in to chrome
 2. Tap on Menu > Settings > Tap on signed in user > Tap on Sync.
 3. Scroll down to Encryption

Observed results:
Encryption box is not highlighted completely 

Expected results:
Encryption box should be highlighted completely 

Number of times you were able to reproduce: 5/5
Bug reproducible after clean install: Yes
Bug reproducible after clearing cache and cookies: Yes
Bug reproducible on Chrome Mobile on Android: NA
Bug reproducible on Dolphin/Safari/Firefox: NA
Bug reproducible on current stable build (App Version, iOS Version): No in M55.0.2883.79
Bug reproducible on the current beta channel build (App Version, iOS Version): Yes in M56

Link to Image
M56 :
https://drive.google.com/a/google.com/file/d/0B--UpU2GW2EpVV9SbGNCcWVzODg/view?usp=sharing

M55 :
https://drive.google.com/a/google.com/file/d/0B--UpU2GW2EpaHlLdV9Ic1cxTnM/view?usp=sharing