Icon size should update when grid config changes

Bug: 123311886

More context: after IDP changes, DeviceProfile member is never updated
with newly calculated values.

However, all apps is still seriously broken, and I didn't address that
in this CL because jon may be working on it.

Change-Id: I69447a44c30ee467eec52b04bff0dc1afa5696a9
1 file changed