Refactor EvictCache.evict method to accept only one argument

This change is required to be able to refactor and remove duplication
between the classes handling forwarded tasks (EvictCache and
DispatchEvent). Having only one argument will allow to create a generic
base class where common things will be done, such as setting/resetting
the context.

Change-Id: I9c303e02bfcb4da67f336e09332f71596188967e
6 files changed