Revert "Kill app long press back: use a separate class"

This reverts commit 3d020351a01dee075a9745b5e78b6862b1fd8283.

Change-Id: I8ae6a8ed4eac21cb0018ac5d24b5932f590f2ba4
ChangeId: Ic7e08461ab64f5668faa99a00e836b84d02e69ff