FrameworkBase: Fix NullPointerException of AMS

If AMS check excessive power usage just after
app record cleaned up, NullPointerException
will happen, because baseProcessTracker will
be invoked in power usage check but it has been
set as null when record cleaned up.

Change-Id: Iad61597d2e119749a0b2ac613727a5ad4fa517b3
CRs-Fixed: 2357915
1 file changed