set_icon
Description:
Sets the icon for the bookmark for uri.
If href is null, unsets the currently set icon. href can either be a full URL for
the icon file or the icon name following the Icon Naming specification.
If no bookmark for uri is found one is created.
Parameters:
| this | |
| uri |
a valid URI |
| href |
the URI of the icon for the bookmark, or null |
| mime_type |
the MIME type of the icon for the bookmark |