Revert "Bug 930269 - Rename SessionStore.restoreHistoryPrecursor"

This reverts commit 3f7ebff8dbe7875e9e782928bb52544ef357b871.
Bug 512784 - add globally-accessible smart getters for common XPCOM services
aForce
dispatchEvent
List all tabs
Tab Context Menu
Merge branch 'cleanup' into nightly
Bug 867097 - Remove superfluous __SS_tabStillLoading property
Bug 867118 - Remove browser.__SS_data and use a WeakMap instead
setTabValue/deleteTabValue