[Chrome Extension] Remove all cookie data

extension.js

function extrapolateUrlFromCookie(cookie) {
    var prefix = cookie.secure ? "https://" : "http://";
    if (cookie.domain.charAt(0) == ".")
        prefix += "www";

    return prefix + cookie.domain + cookie.path;
}

chrome.cookies.getAll({}, function(cookies) {
    for(var i=0; i<cookies.length;i++) {
        chrome.cookies.remove({url: extrapolateUrlFromCookie(cookies[i]), name: cookies[i].name});
    }
});

Manifest.json

{
    "manifest_version": 2,
    "name": "MyExtension",
    "version": "0.1",
    "description": "My awesome chrome extension!",
    "browser_action":   {
        "default_icon": "icon.png",
        "default_popup": "index.html"
    },
    "background": {
        "page": "background.html"
    },
    "permissions": ["tabs", "cookies", "*://*/"],
    "content_scripts": [{
        "js": ["js/contentscript.js"],
        "matches": ["<all_urls>"]
    }],
    "content_security_policy": "script-src 'self' http://localhost; object-src 'self'"
}