... no longer claim to be one"

This reverts commit e49ca697.

The problem is that superclass dtor does not dispose the accessible object
for the SwFlyInCntFrm because in ~SwFlyFrm the IsAccessibleFrm() and
IsFlyInCntFrm() return false.

Change-Id: Id7018d50f30da5f8e2f0df307453a55a5f2cff69