Forcing a sync can lose out on some history because pages/guids are in the temp table and not the disk moz_places. We could back out bug 559163 and use the slower query now that we do things async with bug
Created attachment 454907 [details] [diff] [review] v1
http://hg.mozilla.org/services/fx-sync/rev/f727d35cecec Select from views to get disk and memory data now that async makes it not block.
Crossweave test case - http://hg.mozilla.org/automation/crossweave/file/83f2790fdd8b/tests/bug575423.test