[PATCH 7 of 7 bm-refactor V3] bookmarks: factor method _printer out of for loop in printbookmarks

[Sean Farley]

Martin von Zweigbergk <martinvonz at google.com> writes:

> I think even _print is better than _printer. Maybe I'll use that, or maybe
> something else. _printbookmarks?

_printbookmarks is fine with me.
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