title: Chrome storage sync - the stored value is deleted
body: <p>I am facing with a strange problem with chrome storage sync. The problem occurs even when I am not logged in to my google account. My chrome extension use it to store the user JWT token (I know, the token is not encrypted and should not be stored here). The token is stored by chrome.storage.set and it works fine. But sometimes the token is deleted from chrome.storage... Excluding the case when the chrome extensions is reloaded in chrome://extension because clearing variables in that case is correct. I can not reproduce my issue even if I log off from my google account/close chrome/ kill chrome process/ reboot system/ reconnect. Do you know any chrome mechanism that may clear chrome storage async without user's ingerention? Is there any lifetime for the variable stored in chrome storage that may be changed or overridden?</p>