Bug 883136 - add test to count layout flushes caused by panels.  r=enndeakin?
Bug 883136 - reduce layout flushes in panels.  r=enndeakin?
Bug 833386 - Tests for TextTrackCue objects r=rillian,cpearce

This patch is primarily the work of Marcus Saad (msaad) and Jordan
Raffoul (jbraffoul) at Seneca College.
Backout 24de4eda70e2 (bug 530985) for failures in test_bug 450930.xhtml, CLOSED TREE
Bug 887358 - Change '= 0' assignments for ptrs in nsHttpChannel to '= nullptr' r=sworkman
Bug 887621 - add checked css state for navbar buttons. r=bbondy
Bug 885005 - update the about firefox privacy link. r=jwilde
Test only patch - Bug 626833 - Intermittent failure in test_0200_app_launch_apply_update.js. r=bbondy