UserAgent: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.102 Safari/537.36

Steps to reproduce the problem:
1. Sign in any account in chrome, say Gmail
2. Open Opera browser and go to Gmail
3. We can access gmail in Opera without entering login     info.
4.Or logout from opera ,the same happens in Chrome automatically

What is the expected behavior?
The both browsers should work independently. The chrome details should not share with any other browsers.

What went wrong?
The accounts signed in chrome browser can be used through a Opera browser. The accounts means Facebook,Gmail. For example, I can open a Gmail account which is signed in Chrome from an Opera browser without entering login information there. Also if i logout an account from the opera browser it reflects in the chrome too, means the same account would be signed out automatically from Chrome.

Did this work before? N/A 

Chrome version: 50.0.2661.102  Channel: stable
OS Version: 6.3
Flash Version: Shockwave Flash 21.0 r0

I think the issue would be the both browsers might be sharing the same sessional details including the login information etc.
  So, the both browsers Chrome and Opera cannot be used parallally in a same computer as the account change made in opera affects the Chrome. 
  You can verify the bug by installing the two versions of the browsers and OS i specified.
  Sir/Madam, I request you a sudden action on my report.

Thank you

VERSION
Chrome Version: 50.0.2661.102 m ,the latest product from google
Opera Version : 37.0.2178.43 stable
Operating System: Windows 8.1 Pro