Leaving the logic of starting up the event dispatcher to the call site,
unified both the case of a custom event dispatcher and the default
event dispatcher.

The data argument is left in due to the static nature of the function.

Change-Id: Ia2020e39ccc67cd5a583d4e614dd978b2ec44dba
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>