Samael Wang ada8242de0 Bug 1347823 - Part 2: Move HistoryTracker to nsSHistory and bind its event target to the TabGroup. r=smaug
Convert the singleton HistoryTracker implementation to a per-nsSHistory based
implementation so that it can be bound to a TabGroup.

MozReview-Commit-ID: 7cMtArsO5lQ

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extra : rebase_source : 3711bc7f7afaa40772035e24270d4fde1d17924a
2017-04-27 18:59:11 +08:00
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