nsIWebBrowserChrome2 is an extension to nsIWebBrowserChrome.
Called when the status text in the chrome needs to be updated. This
method may be called instead of nsIWebBrowserChrome::SetStatus. An
implementor of this method, should still implement SetStatus.
| statusType | Indicates what is setting the text. |
| status | Status string. Null is an acceptable value meaning no status. |
| contextNode | An object that provides context pertaining to the status type. If statusType is STATUS_LINK, then statusContext may be a DOM node corresponding to the source of the link. This value can be null if there is no context. |