Work out dependencies between offline page mode and request coordinator

We need to clarify what the dependencies between the two should be and which one should be constructed/destroyed first.

This is to properly handle the user data objects that may hold pointers to both, like download UI adapter.
 

Work out dependencies between offline page model and request coordinator

We need to clarify what the dependencies between the two should be and which one should be constructed/destroyed first.

This is to properly handle the user data objects that may hold pointers to both, like download UI adapter.