Chrome Extension: In Tabs doc don't exist this "chrome.tabs.getSelected" but I see aniway in examples

as title I can't able find this method into the Api -> Tabs... Way and where? Thanks'

It was deprecated in Chrome 16. The correct way is to use chrome.tabs.query with active:true and lastFocusedWindow:true.

// Get the current active tab in the lastly focused window
chrome.tabs.query({
    active: true,
    lastFocusedWindow: true
}, function(tabs) {
    // and use that tab to fill in out title and url
    var tab = tabs[0];
    run({
        url: tab.url,
        description: tab.title
    });
});