Bug 914985.  Adjust browser_tabopen_reflows test to deal with a shorter stack to the reflow and log more information when it fails.  r=ttaubert
Bug 914438.  Prevent propagation of SSTabRestored events in tests when we close the relevant tab.  r=dao
Bug 915100.  Make sure to actually include the headers we need in UnionTypes.h.  r=khuey