Bug 844323 - Follow-up: Fix typo in BrowserElementChildPreload that was breaking bg --> fg transitions in childVisibilityChanged. r=khuey

Also modify the test so it catches this mistake.
Bug 852847 - Part 4: Fix a child-process shutdown leak around nested event loops. r=smaug

This also fixes a non-shutdown leak which occurs if you remove an
<iframe mozbrowser> from the DOM while it's processing an alert().
Revert "Bug 809430 - Add symbol versions. r=glandium"

This reverts commit ece65b368065a3ad013035177c8f561ad1015887.
Bug 852847 - Part 5: Fix assertions caused by part 4. r=me