* `frameName` String
* `disposition` String - Can be `default`, `foreground-tab`, `background-tab`,
`new-window` and `other`.
+* `options` Object - The options which will be used for creating the new
+ `BrowserWindow`.
Emitted when the page requests to open a new window for a `url`. It could be
requested by `window.open` or an external link like `<a target='_blank'>`.
* `frameName` String
* `disposition` String - Can be `default`, `foreground-tab`, `background-tab`,
`new-window` and `other`.
+* `options` Object - The options which should be used for creating the new
+ `BrowserWindow`.
Fired when the guest page attempts to open a new browser window.