base

Convert mHistory to mTaskHistory (7)

- Remove TaskRecord from mTaskHistory and mTaskIdToTaskRecord when
last ActivityRecord is removed from it.
- Convert finishActivityLocked from mHistory to mTaskHistory.
- Convert navigateUpToLocked from mHistory to mTaskHistory.
- Convert removeHistoryRecordsForAppLocked from mHistory to
mTaskHistory.
- Convert moveHomeToFrontLocked from mHistory to mTaskHistory.

Change-Id: Ic632a8213f48dda1126c5e6853325a298b54f25f