Bug 826650 - GC: Recalculation of GC fullness in EndSweepPhase broken r=billm

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extra : rebase_source : cac1534972ae56c5edeb2635dfd9c227209f69d9
Bug 826673 - GC: Only finish sweeping the current compartment group on reset r=billm

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extra : rebase_source : ccf87362e671c9bd90109816444f5b293b17d997
Bug 819428 - Re-jig keyboard navigation for the Downloads Panel. r=mak.
Bug 829858 - Null dereference in nsHttpChannel::InitOfflineCacheEntry(), r=bsmith
Bug 804372 - Allow values for TrackNumber > 0; map TrackNumber to external index r=kinetik