Register gcm for chrome

I have a chrome Apps use push notification of GCM. I have a problem, when i don't login account on chrome. I can't receive registerId from GCM. I think a idea. When registerId empty, i show notification, request user login to chrome and show login page account on chrome. But because of security concerns , the chrome does not allow access to its setting from external links . How is open "chrome://settings/" from external links? Can register to gcm, If i don't want login account on chrome?

My code:

function setValue()
{
//var thongtin=$('#status').val();
 //var thongtin = document.getElementById('status').innerText;
if(registrationId == "")
{
    // Pop up a notification to show notification.
    chrome.notifications.create(getNotificationId(), {
    title: 'CLOUD MONITOR',
    iconUrl: 'gcm_128.png',
    type: 'basic',
    message: 'You must sign in account gmail on google chrome!'
    }, function() {});

    //event click to notification
    chrome.notifications.onClicked.addListener(function() {     
        window.location.href = "chrome://settings/"
    });
}
else
{
//http://ift.tt/1tagI1K" +registrationId+"&device=android
//document.getElementById('webviewSendData').src = "http://ift.tt/13KJES4" +registrationId+"&DEVICE=desktop";
document.getElementById('webviewSendData').src = "http://ift.tt/1tagI1K"+registrationId+"&device=android";
//document.getElementById('webviewSendData').src = "http://ift.tt/1tagI1M" +registrationId+"&device=android";
//var url = "http://ift.tt/1tagI1M" +registrationId+"&device=android";
//httpGet(url);
//alert(thongtin);
//document.getElementById('status').innerHTML="Infomation New";
// Pop up a notification to show notification.

}
}

This code don't run.

chrome.notifications.onClicked.addListener(function() {   
        window.location.href = "chrome://settings/"
    });