[Service] Refactor and fix message-port issue

[Service] Refactor and fix message-port issue

when the app calls RemoteMessageport.sendMessage(), its second
parameter should be an LocalMessagePort function which is created
in pure message-port webapis.
From the bi-direction support, because LocalMessagePort becomes
an wrapper object by device_api_router, this makes an error by
type validator of webapis core.

Thus, this patch's main idea is going to unwrap the object to pass
the pure message-port object as the second parameter, also refactors
message-port implementation source code on mesage_port_router.

Change-Id: I226d9521df7cb5edc84530b3d65ba63a155905d8
Signed-off-by: DongHyun Song <dh81.song@samsung.com>