chrome和360极速浏览器插件图标怎么改？

哪位大神教教我这个图标的图片在哪段代码中修改？

manifest.json 当中的icon属性

 {
"name": "My Extension",
"version": "2.1",
"description": "Gets information from Google.",
"icons": { "128": "icon_128.png" },
"background_page": "bg.html",
"permissions": ["http://*.google.com/", "https://*.google.com/"],
"browser_action": {
"default_title": "",
"default_icon": "icon_19.png",
"default_popup": "popup.html"
}
}

详细的参考 http://open.chrome.360.cn/extension_dev/manifest.html#icons