disable chrome extension's badge

Question

I am developing a chrome extension that shows notifications.
I am showing the notifications using these functions chrome.browserAction.setBadgeBackgroundColor and chrome.browserAction.setBadgeText.
This is what it looks like:

After the user have seen the notifications I want to remove this badge.

I have tried to make it transparent but this was the result:

Can anyone help me how to remove the badge, or if there is another way that makes what I want?

Solution
When writing an empty text, the badge goes away.

Answer 1

To remove the badge count, simply set the text as an empty string:

chrome.browserAction.setBadgeText({
    'text': '' //an empty string displays nothing!
});