chromium/chrome/test/data/extensions/api_test/webrequest_hosted_app/manifest.json

{
    "name": "webRequest extension",
    "version": "1",
    "manifest_version": 2,
    "background": {
        "scripts": ["background.js"],
        "persistent": true
    },
    "permissions": [
        "webRequest",
        "<all_urls>"
    ]
}