Remove the context argument from Managed::hasInstance()

Change-Id: I33937a469c7ad1c6c9913068e7dc898a39d8bf49
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>
Remove the ExecutionContext parameter from Managed::get/setLookup

Change-Id: I9d3763b97438db83fef899917cbaee2f7cd59f96
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>
Remove the execution context from most lookup calls.

Change-Id: I6f2bdfa233ebda1596a5a1d2b9d418cd45033d23
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>