Changes the URI of a bookmark item from @old_uri to @new_uri. Any
existing bookmark for @new_uri will be overwritten. If @new_uri is
%NULL, then the bookmark is removed.
In the event the URI cannot be found, %FALSE is returned and
@error is set to #G_BOOKMARK_FILE_ERROR_URI_NOT_FOUND.
Changes the URI of a bookmark item from @old_uri to @new_uri. Any existing bookmark for @new_uri will be overwritten. If @new_uri is %NULL, then the bookmark is removed.
In the event the URI cannot be found, %FALSE is returned and @error is set to #G_BOOKMARK_FILE_ERROR_URI_NOT_FOUND.